Treatment method for living tissue using energy

ABSTRACT

A treatment method for a living tissue using energy includes a first step of outputting energy to a grasped living tissue and raising a temperature of cells of the grasped living tissue, a second step of, after the first step, outputting high-frequency energy to the grasped living tissue and destroying cell membranes of the grasped living tissue to discharge proteins in the cells to the outside of the cells, and a third step of, after the second step, outputting heat energy to the living tissue and welding the proteins to each other while dehydrating the grasped living tissue.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a Continuation-in-Part application of U.S. patent application Ser. No. 12/060,359, filed Apr. 1, 2008, the entire contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a treatment method for a living tissue using energy.

2. Description of the Related Art

In US Patent Application Publication No. US2005/0113828 A1, an electrosurgical instrument is disclosed in which a living tissue is held between a pair of openable/closable jaws, and a high-frequency current is applied between the pair of jaws holding the living tissue therebetween to denature the held living tissue. Here, in the electrosurgical instrument, high-frequency energy flows thorough the living tissue to immediately denature the inside of the tissue by use of Joule heat generated in the living tissue. Then, the electrosurgical instrument immediately destroys cell membranes to release, from the destroyed cell membranes, an intracellular fluid including polymer compounds typified by protein, and homogenizes (liquefies) intracellular components with extracellular components typified by collagen. Such homogenization can result in the mutual bonding of bonding faces of the living tissues and the mutual bonding of interlayers of the tissues. It is to be noted that when the high-frequency energy is applied to the living tissue, the state (impedance or phase information) of the living tissue can be detected. In general, there are characteristics that as the impedance of the held living tissue is high, the output of the high-frequency energy which can be applied to the living tissue decreases.

In Jpn. Pat. Appln. KOKAI Publication No. 2001-190561, a coagulation treatment instrument is disclosed in which a pair of openable/closable jaws are provided with a ceramic heater. In the ceramic heater, a heating element is embedded, and when a power is supplied through the heating element, the ceramic heater generates heat. Then, the heat of the ceramic heater is conducted to the living tissue held between the pair of jaws to coagulate the living tissue. At this time, if the heat is generated at a set temperature from the heating element, the heat energy can uniformly be applied to the living tissue regardless of the state of the living tissue. Therefore, the desired output can uniformly be performed, even in a state in which the high-frequency energy cannot sufficiently be output to the living tissue in the treatment using the high-frequency energy, for example, after the impedance of the living tissue rises.

BRIEF SUMMARY OF THE INVENTION

According to a first aspect of the present invention, there is provided a treatment method for a living tissue using energy including:

a first step of outputting energy to a grasped living tissue and raising a temperature of cells of the grasped living tissue;

a second step of, after the first step, outputting high-frequency energy to the grasped living tissue and destroying cell membranes of the grasped living tissue to discharge proteins in the cells to the outside of the cells; and

a third step of, after the second step, outputting heat energy to the living tissue and welding the proteins to each other while dehydrating the grasped living tissue.

Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram showing a treatment system according to a first embodiment of the present invention;

FIG. 2 is a schematic block diagram showing the treatment system according to the first embodiment;

FIG. 3A is a schematic diagram showing the treatment system according to the first embodiment in a case where high-frequency energy is applied to a living tissue to treat the tissue with a bipolar surgical treatment instrument;

FIG. 3B is a schematic diagram showing the treatment system according to the first embodiment in a case where high-frequency energy is applied to the living tissue to treat the tissue with a monopolar surgical treatment instrument;

FIG. 4 is a schematic flow chart showing a case where a treatment using the high-frequency energy and a treatment using heat energy are performed with respect to the living tissue by use of the treatment system according to the first embodiment;

FIG. 5 is a schematic graph showing a relation between impedance and time in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the first embodiment;

FIG. 5A is a schematic block diagram showing a treatment system according to a first modification of the first embodiment;

FIG. 5B is a schematic graph showing a relation between phase and time obtained from output voltage value information, output voltage phase information, output current value information and output current phase information in a case where a treatment using high-frequency energy and a treatment using heat energy are performed with respect to a living tissue by use of the treatment system according to the first modification of the first embodiment;

FIG. 6 is a schematic flow chart in a case where a treatment using high-frequency energy and a treatment using heat energy are performed with respect to a living tissue by use of a treatment system according to a second modification of the first embodiment;

FIG. 7 is a schematic flow chart in a case where a treatment using high-frequency energy and a treatment using heat energy are performed with respect to a living tissue by use of a treatment system according to a third modification of the first embodiment;

FIG. 8 is a schematic block diagram showing a treatment system according to a fourth modification of the first embodiment;

FIG. 9 is a schematic diagram showing a treatment system according to a second embodiment of the present invention;

FIG. 10A is a schematic vertical sectional view showing a shaft of an energy treatment instrument and a state where a first holding member and a second holding member of a holding section are closed in the treatment system according to the second embodiment;

FIG. 10B is a schematic vertical sectional view showing the shaft of the energy treatment instrument and a state where a first holding member and a second holding member of a holding section are opened in the treatment system according to the second embodiment;

FIG. 11A is a schematic plan view showing the first holding member on a side close to the second holding member in the holding section of the energy treatment instrument of the treatment system according to the second embodiment;

FIG. 11B is a schematic vertical sectional view showing the first holding member cut along the 11B-11B line of FIG. 11A in the holding section of the energy treatment instrument of the treatment system according to the second embodiment;

FIG. 11C is a schematic transverse sectional view showing the first holding member cut along the 11C-11C line of FIG. 11A in the holding section of the energy treatment instrument of the treatment system according to the second embodiment;

FIG. 12 is a schematic diagram showing a state in which a heater member is fixed to the back surface of a first high-frequency electrode arranged on the first holding member of the holding section of the energy treatment instrument in the treatment system according to the second embodiment;

FIG. 13 is a schematic block diagram showing the treatment system according to the second embodiment;

FIG. 14 is a schematic flow chart in a case where a treatment using high-frequency energy and a treatment using heat energy are performed with respect to a living tissue by use of the treatment system according to the second embodiment;

FIG. 15 is a schematic graph showing the change of the impedance of the living tissue with respect to a time when predetermined high-frequency energy is input into the living tissue, and also showing the change of the impedance of the living tissue with respect to a time when the impedance reaches a predetermined value and then predetermined heat energy is input instead of the high-frequency energy, in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the second embodiment;

FIG. 15A is a schematic graph showing the change of an energy output with respect to time in a case where energy is exerted to the living tissue to treat the living tissue by use of the treatment system, and showing a high-frequency energy intermittent output period to destroy cell membranes, discharge substances in the cell membranes, for example, proteins and the like and join tissue layers to each other while generating heat from the living tissue itself and a heat energy output period to coagulate the living tissue and remove water from the tissue according to the second embodiment;

FIG. 15B is a schematic graph showing the change of the impedance and the change of a temperature of the living tissue with respect to the time in a case where the energy is exerted to the living tissue to treat the living tissue as shown in FIG. 15A by use of the treatment system according to the second embodiment;

FIG. 15C is a schematic graph showing the change of the energy output with respect to the time in a case where the energy is exerted to the living tissue to treat the living tissue by use of the treatment system, and showing the high-frequency energy intermittent output period to destroy the cell membranes, discharge the substances in the cell membranes, for example, the proteins and the like and join the tissue layers to each other while generating the heat from the living tissue itself and the heat energy output period to coagulate the living tissue and remove the water from the tissue according to the second embodiment;

FIG. 16 is a schematic diagram showing a modification of the treatment system according to the second embodiment;

FIG. 17A is a schematic graph showing one example of an input process of high-frequency energy into a living tissue with respect to time and an input process of heat energy into the living tissue with respect to time, in a case where a treatment using the high-frequency energy and a treatment using the heat energy are performed with respect to the living tissue by use of a treatment system according to a first modification of the second embodiment;

FIG. 17B is a schematic graph showing one example of the input process of the high-frequency energy into the living tissue with respect to the time and the input process of the heat energy into the living tissue with respect to the time, in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the first modification of the second embodiment;

FIG. 17C is a schematic graph showing one example of the input process of the high-frequency energy into the living tissue with respect to the time and the input process of the heat energy into the living tissue with respect to the time, in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the first modification of the second embodiment;

FIG. 17D is a schematic graph showing one example of the input process of the high-frequency energy into the living tissue with respect to the time and the input process of the heat energy into the living tissue with respect to the time, in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the first modification of the second embodiment;

FIG. 17E is a schematic graph showing one example of the input process of the high-frequency energy into the living tissue with respect to the time and the input process of the heat energy into the living tissue with respect to the time, in a case where the treatment using the high-frequency energy and the treatment using the heat energy are performed with respect to the living tissue by use of the treatment system according to the first modification of the second embodiment;

FIG. 18 is a schematic diagram showing a state in which a heater member is fixed to the back surface of a first high-frequency electrode provided on a first holding member of a holding section of an energy treatment instrument in a treatment system according to a second modification of the second embodiment;

FIG. 19A is a schematic plan view showing a first holding member on a side close to a second holding member in a holding section of a surgical treatment instrument according to a third modification of the second embodiment;

FIG. 19B is a schematic vertical sectional view showing the first holding member cut along the 19B-19B line of FIG. 19A in the holding section of the surgical treatment instrument according to the third modification of the second embodiment;

FIG. 19C is a schematic transverse sectional view showing the first holding member cut along the 19C-19C line of FIG. 19A in the holding section of the surgical treatment instrument according to the third modification of the second embodiment;

FIG. 19D is a schematic plan view showing a first holding member on a side close to a second holding member in a holding section of a surgical treatment instrument according to a further modification of the third modification of the second embodiment;

FIG. 20A is a schematic perspective view showing a state in which two intestinal canals of a small intestine are anastomosed, and a schematic diagram cut along the 20A-20A line of FIG. 20C described later;

FIG. 20B is a schematic diagram showing an enlarged part denoted with symbol 20B of FIG. 20A;

FIG. 20C is a schematic diagram showing a state in which two intestinal canals of the small intestine are anastomosed, and then the ends of the intestinal canals are closed;

FIG. 20D is a schematic diagram as a modification of FIG. 20B showing the enlarged part denoted with the symbol 20B of FIG. 20A;

FIG. 21A is a schematic plan view showing a first holding member on a side close to a second holding member in a holding section of a surgical treatment instrument according to a fourth modification of the second embodiment;

FIG. 21B is a schematic plan view showing the first holding member on the side close to the second holding member in the holding section of the surgical treatment instrument according to the fourth modification of the second embodiment;

FIG. 21C is a schematic plan view showing the first holding member on the side close to the second holding member in the holding section of the surgical treatment instrument according to the fourth modification of the second embodiment;

FIG. 22A is a schematic plan view showing the first holding member on the side close to the second holding member in the holding section of the surgical treatment instrument according to a fifth modification of the second embodiment;

FIG. 22B is a schematic transverse sectional view cut along the 22B-22B line of FIG. 22A and showing the first holding member in the holding section of the surgical treatment instrument according to the fifth modification of the second embodiment;

FIG. 22C is a schematic transverse sectional view cut along the 22B-22B line of FIG. 22A and showing a first holding member in a holding section of a surgical treatment instrument according to a further modification of the fifth modification of the second embodiment;

FIG. 23 is a schematic diagram showing a modification of a treatment system according to a third embodiment;

FIG. 24A is a schematic vertical sectional view showing a state in which a main body side holding section and a detachable side holding section of an energy treatment instrument according to the third embodiment are engaged, and the detachable side holding section is disposed away from the main body side holding section;

FIG. 24B is a schematic vertical sectional view showing a state in which the main body side holding section and the detachable side holding section of the energy treatment instrument according to the third embodiment are engaged, and the detachable side holding section is engaged with the main body side holding section;

FIG. 24C is a schematic diagram showing the front surface of the main body side holding section of the energy treatment instrument according to the third embodiment; and

FIG. 25 is a schematic diagram showing the front surface of the main body side holding section of the energy treatment instrument according to a modification of the third embodiment.

DETAILED DESCRIPTION OF THE INVENTION

The best mode for carrying out this invention will hereinafter be described with reference to the drawings.

First Embodiment

A first embodiment will be described with reference to FIGS. 1 to 5.

As shown in FIG. 1, a treatment system 10 includes a surgical treatment instrument (a treatment instrument) 12, an energy source 14 and a foot switch 16. The surgical treatment instrument 12 is connected to the energy source 14 via, for example, a pair of connection cables 22 a, 22 b for high-frequency energy output, and one connection cable 24 for heat energy output. The foot switch 16 is connected to the energy source 14 via a connection cable 26 for the switch.

The surgical treatment instrument 12 includes a pair of scissor constituting members 32 a, 32 b; a pair of handle sections 34 a, 34 b which are provided on the proximal ends of the scissor constituting members 32 a, 32 b and which are to be manually held and operated by an operator; and a pair of jaws (holding members, treatment sections) 36 a, 36 b which are provided on the distal ends of the scissor constituting members 32 a, 32 b and which hold a living tissue L_(T) to be treated to perform a treatment such as coagulation or incision.

The pair of scissor constituting members 32 a, 32 b are superimposed so that the members substantially intersect with each other between the distal ends of the members and the proximal ends thereof. An intersecting portion between the scissor constituting members 32 a and 32 b is provided with a support pin 38 which rotatably connects the scissor constituting members 32 a, 32 b to each other.

The pair of handle sections 34 a, 34 b are provided with rings 42 a, 42 b to be held with operator's fingers. When the operator holds the rings 42 a, 42 b with operator's thumb and middle finger, respectively, to perform an opening/closing operation, the jaws 36 a, 36 b open/close in conjunction with the operation.

The pair of jaws 36 a, 36 b are provided with energy release elements for applying energy to the living tissue L_(T). One jaw 36 a is provided with a first high-frequency electrode 52 a as the energy release element. The other jaw 36 b is provided with a second high-frequency electrode 52 b and a heater member 54 as the energy release elements. Among these elements, the heater member (a heat generation element) 54 is embedded in the other jaw 36 b in a state in which the member is fixed to the back surface of the second high-frequency electrode 52 b.

Thus, in the pair of jaws 36 a, 36 b, the first and second high-frequency electrodes 52 a, 52 b include conductive tissue holding faces (tissue grasping faces). It is to be noted that the heater member 54 is provided with a thin film resistance and a thick film resistance as heat generation patterns. The thin film resistance is formed by a thin film formation process such as physical vapor deposition (PVD) and chemical vapor deposition (CVD). The thick film resistance is formed by a thick film formation process such as screen printing. The heat generation pattern is formed of a high melting metal such as molybdenum having a so-called positive temperature coefficient such that an electric resistance increases in proportion to a temperature.

In the pair of scissor constituting members 32 a, 32 b, power supply lines 62 a, 62 b for supplying electric signals to the electrodes 52 a, 52 b are arranged, respectively. The power supply lines 62 a, 62 b extend from the jaws 36 a, 36 b to the handle sections 34 a, 34 b, respectively. The rings 42 a, 42 b are provided with bipolar terminals 64 a, 64 b, respectively. The bipolar terminals 64 a, 64 b are electrically connected to the power supply lines 62 a, 62 b, respectively. Therefore, in a case where the energy is supplied to the electrodes 52 a, 52 b through the power supply lines 62 a, 62 b in a state in which the living tissue L_(T) is held between the jaws 36 a and 36 b (between the electrodes 52 a and 52 b), a high-frequency current is supplied through the living tissue L_(T) between the electrodes 52 a and 52 b, whereby the living tissue L_(T) generates heat.

In the other scissor constituting member 32 b of the pair of scissor constituting members 32 a, 32 b, a power supply line 66 for supplying a power to the heater member 54 is provided. The power supply line 66 extends from the jaw 36 b to the handle section 34 b. The ring 42 b is provided with a heater member terminal 68 electrically connected to the power supply line 66. Therefore, when the energy is supplied to the heater member 54 through the power supply line 66, the heater member 54 generates heat, and the heat (heat energy) is conducted to the second high-frequency electrode 52 b which comes in close contact with the heater member 54, and is transmitted to the living tissue L_(T) which comes in contact with the front surface of the second high-frequency electrode 52 b.

According to such a structure, the heater member 54 is provided on at least one of the pair of jaws 36 a, 36 b which are supported openably/closably to grasp the living tissue L_(T) (it is also preferable to provide the heat members on both of the jaws), and the heater member functions as heat generation means capable of applying the heat energy for coagulating the living tissue L_(T) grasped between the jaws 36 a and 36 b.

Therefore, the surgical treatment instrument 12 can supply the high-frequency current between these electrodes 52 a and 52 b to apply the high-frequency energy to the living tissue L_(T) grasped between the jaws 36 a and 36 b. Moreover, the energy is applied to the heater member 54 to generate the heat therefrom, whereby the heat energy obtained by the heat generation of the heater member 54 can be transmitted to the living tissue L_(T) through the second electrode 52 b to treat the tissue.

It is to be noted that the foot switch 16 includes a pedal 16 a. When the pedal 16 a is pressed, the high-frequency energy and/or the heat energy is output based on an appropriately set state (a state in which an energy output amount, an energy output timing or the like is controlled). When the pressed pedal 16 a is released, the output of the high-frequency energy and heat energy is forcibly stopped.

As shown in FIG. 2, a high-frequency energy driving circuit 72 and a heat generation element driving circuit 74 are arranged in the energy source 14. The high-frequency energy driving circuit 72 and the heat generation element driving circuit 74 are connected to the energy source 14 via a communication cable 82.

The high-frequency energy driving circuit 72 includes an output control section 92; a variable voltage source (SW power source) 94 which supplies a power for outputting and controlling the high-frequency energy; a power amplifier (AMP) 96 which amplifies a high-frequency power and which shapes an output waveform; a sensor 98 which monitors the high-frequency energy output (a voltage value and a current value); and an operation display panel (setting means of the output control section 92) 100. Among these components, the variable voltage source (SW power source) 94, the power amplifier 96 and the sensor 98 are successively connected in series. The sensor 98 is connected to the surgical treatment instrument 12 via the connection cables 22 a, 22 b for the high-frequency energy output. The output control section 92 is connected to the variable voltage source 94, the power amplifier 96 and the sensor 98. Furthermore, the output control section 92 is connected to the operation display panel 100. The operation display panel 100 displays a high-frequency energy output amount monitored by the sensor 98 through the electrodes 52 a, 52 b, and the output control section 92 sends control signals to the variable voltage source 94 and the electrode amplifier 96 based on a monitor signal from the sensor 98. Thus, the high-frequency output is controlled.

Therefore, while the power supplied from the variable voltage source 94 and amplified by the power amplifier 96 is controlled by the output control section 92, the power is transmitted from the sensor 98 to the electrodes 52 a, 52 b of the surgical treatment instrument 12 via the connection cables 22 a, 22 b for the high-frequency energy output.

The heat generation element driving circuit 74 includes an output control section 102 for the heat generation element driving circuit, an output section 104, a sensor 106 and an operation display panel 108. The output section 104 supplies a power (energy) for allowing the heater member 54 to generate heat. The sensor 106 monitors the value of the output to the heater member 54 (a voltage value, a current value), and sends a monitor signal to the output control section 102. The output control section 102 calculates various parameters such as a voltage, a current, a power and a resistance value based on the monitor signal from the sensor 106.

It is to be noted that the heat generation pattern of the heater member 54 has a positive temperature coefficient. Therefore, the output control section 102 can further calculate a temperature T of the heater member 54 from the calculated resistance value. The output control section 102 sends a control signal to the output section 104 based on the calculation results of the parameters. Therefore, the output control of the heater member 54 is performed.

The output control section 92 of the high-frequency energy driving circuit 72 is connected to the output control section 102 of the heat generation element driving circuit 74 via the communication cable 82 capable of bidirectionally transmitting signals. The output control section 92 of the high-frequency energy driving circuit 72 sends the ON/OFF signal of the foot switch 16 to the output control section 102 of the heat generation element driving circuit 74. The output control section 92 of the high-frequency energy driving circuit 72 sends, to the output control section 102 of the heat generation element driving circuit 74, a signal indicating the magnitude of an impedance (an impedance in a state in which the living tissue L_(T) is held between the electrodes 52 a and 52 b) Z during the output of the high-frequency energy calculated based on the monitor signal (the voltage value, the current value) of the sensor 98. It is to be noted that the impedance Z is calculated by the output control section 92 based on the monitor signal from the sensor 98. Therefore, the electrodes 52 a, 52 b and the high-frequency energy driving circuit 72 are high-frequency energy output sections for use in exerting the high-frequency energy to the living tissue L_(T) grasped between the jaws 36 a and 36 b to denature the living tissue L_(T) and collecting the impedance information Z (biological information) of the living tissue L_(T).

The output control section 102 of the heat generation element driving circuit 74 sends, to the output control section 92 of the high-frequency energy driving circuit 72, a signal indicating the temperature T of the heater member 54 calculated based on the monitor signal (the voltage value, the current value) of the sensor 106. The operation display panel 100 of the high-frequency energy driving circuit 72 is connected to the operation display panel 108 of the heat generation element driving circuit 74 via the output control section 92 of the high-frequency energy driving circuit 72, the communication cable 82 and the output control section 102 of the heat generation element driving circuit 74. Therefore, the settings and display contents of the operation display panels 100, 108 are associated with each other.

As described above, the surgical treatment instrument 12 of the embodiment functions as a bipolar high-frequency treatment instrument as shown in FIGS. 2 and 3A, and functions as the treatment instrument for the heat generation as shown in FIG. 2.

A method for using the treatment system 10 (an operation) will hereinafter be described.

An operator operates the operation display panels (setting means) 100, 108 before the treatment of a patient, to input and set, into the output control sections 92, 102, the output conditions (a set power Pset [W] of the high-frequency energy output, a set temperature Tset [° C.] of the heat energy output, threshold values Z1, Z2 of the impedance Z of the living tissue L_(T), etc.) of the surgical treatment instrument 12. The threshold value Z1 is preferably set in a state in which when the drying of the living tissue L_(T) proceeds and the value of the impedance Z rises, the high-frequency energy output lowers, and appropriate energy cannot be introduced, or a state slightly previous to this state. On such conditions, the threshold value Z1 is set to an empirically appropriate value. With regard to the threshold value Z2, on such conditions that the drying of the living tissue L_(T) further proceeds, the threshold value Z2 is set to an empirically appropriate value. It is to be noted that the threshold values Z1, Z2 may be incorporated in a program stored in the output control section 92 in advance, and does not necessarily have to be set by the operator.

It is to be noted that with regard to a relation between the threshold values Z1 and Z2 of the impedance Z, the threshold value Z2 is larger than the threshold value Z1. The threshold value Z1 is preferably, for example, about 500 [Ω] to 1500 [Ω], and the threshold value Z2 is preferably about 2000 [Ω] to 3000 [Ω]. It is also preferable that the threshold values Z1, Z2 are set within predetermined ranges (e.g., the threshold value Z1 is in a range of 500 [Ω] to 1500 [Ω], and the threshold value Z2 is in a range of 2000 [Ω] to 3000 [Ω]) and that values out of the predetermined ranges cannot be set.

The operator holds with fingers the rings 42 a, 42 b of the handle sections 34 a, 34 b of the surgical treatment instrument 12, and operates the surgical treatment instrument 12 to peel, from a peripheral living tissue, the living tissue L_(T) to be subjected to a treatment such as coagulation or incision. Thus, the holding of the living tissue L_(T) as a treatment target is facilitated. Then, the living tissue L_(T) is held and grasped between the jaws 36 a and 36 b.

Subsequently, the operator performs an operation of pressing the pedal 16 a of the foot switch 16, while maintaining a state in which the living tissue L_(T) is held between the jaws 36 a and 36 b. In consequence, the treatment is performed using the high-frequency energy applied to the living tissue L_(T) between the electrodes 52 a and 52 b of the jaws 36 a and 36 b of the surgical treatment instrument 12, or the heat energy transmitted through the electrode 52 a from the heater member 54 which has generated the heat from the energy applied to the heater member 54.

FIG. 4 shows one example of the control flow of the surgical treatment instrument 12 controlled by the high-frequency energy driving circuit 72 and the heat generation element driving circuit 74.

First, the output control section 92 of the high-frequency energy output circuit 72 judges whether or not the pedal 16 a of the foot switch 16 has been pressed by operator's operation based on the signal from the switch 16, that is, whether or not the switch has been turned on (STEP 1).

In a case where the output control section 92 judges that the switch 16 has been turned on, the output control section outputs the high-frequency energy between the electrodes 52 a and 52 b of the jaws 36 a and 36 b of the surgical treatment instrument 12 from the variable voltage source 94 of the high-frequency energy driving circuit 72 via the power amplifier 96, the sensor 98 and the connection cables 22 a, 22 b for the high-frequency energy output (STEP 2). At this time, the output control section supplies the set power Pset [W] preset by the operation display panel 100, that is, a power of, for example, about 20 [W] to 80[W] between the electrodes 52 a and 52 b of the jaws 36 a and 36 b (STEP 3).

Therefore, the first high-frequency electrode 52 a supplies a high-frequency current between the first high-frequency electrode 52 a and the second high-frequency electrode 52 b via the living tissue L_(T) as the treatment target. That is, the high-frequency energy is applied to the living tissue L_(T) grasped between the electrodes 52 a and 52 b. Therefore, Joule heat is generated in the living tissue L_(T) grasped between the electrodes 52 a and 52 b to heat the living tissue L_(T) itself. A cell membrane in the living tissue L_(T) held between the electrodes 52 a and 52 b is destroyed owing to the function of the high-frequency voltage and the function of the Joule heat to release substances from the cell membrane, and the tissue is homogenized with extracellular components including collagen. The high-frequency current is supplied through the living tissue L_(T) between the electrodes 52 a and 52 b, so that further Joule heat acts on the tissue L_(T) homogenized in this manner, and, for example, the bonding faces of the living tissue L_(T) or the layers of the tissue are bonded to each other. Therefore, when the high-frequency current is supplied between the electrodes 52 a and 52 b, the living tissue L_(T) itself generates the heat and is dehydrated, while the inside of the living tissue L_(T) is denatured (the living tissue L_(T) is cauterized).

At this time, the impedance Z of the living tissue L_(T) held between the electrodes 52 a and 52 b is measured by the sensor (collection means for collecting the biological information) 98 through the electrodes 52 a, 52 b. An impedance Z0 at a time of treatment start changes in accordance with the sizes or shapes of the electrodes, but as shown in FIG. 5, the impedance is, for example, about 60 [Ω]. Subsequently, when the high-frequency current is supplied through the living tissue L_(T) to cauterize the living tissue L_(T), the value of the impedance Z once lowers and then rises. Such rise of the value of the impedance Z indicates that a water content is removed from the living tissue L_(T) and that the tissue progressively dries.

Subsequently, the output control section 92 judges whether or not the value of the impedance Z during the high-frequency energy output calculated based on the signal from the sensor 98 exceeds the preset threshold value Z1 (here, about 1000 [Ω] as shown in FIG. 5) (STEP 4). As the threshold value Z1, there is selected a value or so which has empirically been known and at which the rise ratio of the value of the impedance Z becomes dull at a time when a predetermined power is input. Then, in a case where the output control section 92 judges that the value of the impedance Z is smaller than the threshold value Z1, processing is returned to STEP 3. That is, the high-frequency energy for the treatment is continuously applied to the living tissue L_(T) held between the electrodes 52 a and 52 b of the jaws 36 a and 36 b.

On the other hand, in a case where the output control section 92 judges that the value of the impedance Z is the threshold value Z1 or more, the output control section 92 reduces the high-frequency energy output supplied to the electrodes 52 a, 52 b, and switches the output to monitor output (STEP 5).

Here, the monitor output is the output of a weak high-frequency current having such a level that the living tissue L_(T) is not treated. Owing to such monitor output, the change of the impedance Z of the living tissue L_(T) between the jaws 36 a and 36 b can continuously be monitored with the sensor 98 through the electrodes 52 a, 52 b.

Subsequently, in a case where the output control section 92 judges that the value of the impedance Z is the threshold value Z1 or more, a signal is transmitted from the output control section 92 of the high-frequency energy driving circuit 72 to the output control section 102 of the heat generation element driving circuit 74 via the communication cable 82. Then, the output control section 102 of the heat generation element driving circuit 74 supplies the power (the energy) to the heater member 54 so that the temperature of the heater member 54 is a preset temperature Tset [Ω], for example, a temperature of 100[° C.] to 300[° C.] (STEP 5). In consequence, the heater member 54 generates heat. The heat is conducted from the heater member 54 to the second electrode 52 b, and the heat (the heat energy) conducted to the second electrode 52 b coagulates the living tissue L_(T) internally from the side of the front surface of the living tissue L_(T) which comes in contact with the second electrode 52 b. At this time, the living tissue (protein) is integrally denatured, and the water content as a factor for disturbing the mutual bonding of proteins is removed. The high-frequency energy is substantially simultaneously switched to the heat energy, and the cell membrane is destroyed by the high-frequency energy, whereby thermal conductivity improves, and hence the heat can more efficiently be conducted from the heater member 54 to the living tissue.

Subsequently, the output control section 92 judges whether the impedance Z of the living tissue L_(T) monitored in accordance with the monitor output is the preset threshold value Z2 (here, about 2000 [Ω] as shown in FIG. 5) or more (STEP 6). In a case where it is judged that the impedance Z is smaller than the threshold value Z2, the processing is returned to STEP 4. On the other hand, in a case where it is judged that the value of the impedance Z exceeds the threshold value Z2, the output control sections 92, 102 stop the output of the high-frequency energy and heat energy (STEP 7). Then, the treatment of the living tissue L_(T) by use of the treatment system 10 is ended.

It is to be noted that while a series of treatments to output the high-frequency energy and the heat energy in this manner are performed, the pedal 16 a of the foot switch 16 is depressed. When the depressed pedal 16 a is released during the treatment, the output of the high-frequency energy and heat energy is forcibly stopped.

As described above, according to this embodiment, the following effect is obtained.

The high-frequency energy is introduced into the living tissue L_(T) held between the electrodes 52 a and 52 b to generate the Joule heat in the living tissue L_(T), whereby the cell membrane is destroyed to homogenize intracellular and extracellular components, and the tissue is cauterized, whereby the impedance Z can be raised. Then, the living tissue L_(T) into which the high-frequency energy is introduced to destroy the cell membrane and raise the thermal conductivity can be subjected to a coagulation treatment using the heat energy conducted from the heater member 54 allowed to generate the heat.

At this time, the state (the impedance Z or the temperature T) of the living tissue L_(T) held between the jaws 36 a and 36 b is monitored, and a time to switch the introduction of the energy from the introduction of the high-frequency energy to the introduction of the heat energy can automatically be judged and switched in accordance with the preset threshold value Z1 of the impedance Z. In consequence, a series of operations of switching the treatment using the high-frequency energy to the treatment using the heat energy can be realized, so that the treatment can efficiently be performed.

That is, the change of the impedance Z of the high-frequency energy output is measured with the sensor 98 of the high-frequency energy driving circuit 72, and appropriate treatments (the treatment using the high-frequency energy and the treatment using the heat energy) can be performed based on the measured value. Therefore, the threshold values Z1, Z2 are measured in this manner, whereby the operator can perform the treatment in accordance with the tissue denatured state of the living tissue L_(T) by use of the surgical treatment instrument 12, and the fluctuation of the treatment due to operator's sense can be prevented to homogenize (stabilize) the tissue.

Therefore, in a case where the high-frequency energy is combined with the heat conduction from the heat energy to treat the living tissue L_(T) grasped between the jaws 36 a and 36 b in a state in which the introduction timing of the high-frequency energy and heat energy is controlled, the living tissue can efficiently and stably be denatured (the tissue can be cauterized and/or coagulated, etc.). The treatment is performed in this manner, whereby the living tissue L_(T) can be treated in a state in which loss during the introduction of the energy is minimized, and treatment time can be reduced. Therefore, a burden imposed on the patient can largely be reduced.

The pedal 16 a of the foot switch 16 is simply pressed in a state in which the living tissue L_(T) is held between the electrodes 52 a and 52 b of the jaws 36 a and 36 b, whereby both the treatment using the high-frequency energy and the treatment using the heat energy can automatically be performed without being laboriously switched. That is, treatment conditions such as the output Pset, the temperature Tset and the threshold values Z1, Z2 of the impedance Z are set in accordance with the type and state of the living tissue L_(T) in the display panels 100, 108, and the living tissue L_(T) as the treatment target is grasped. Afterward, the pedal 16 a of the switch 16 simply continues to be pressed, whereby the treatment can be performed without requiring any operator's sense. Subsequently, when the threshold value Z2 exceeds the set value, in a state in which the treatment of the living tissue L_(T) is prevented from being excessively performed, the treatment can automatically be ended without requiring any artificial switching between the treatment using the high-frequency energy and the treatment using the heat energy. Therefore, the burden imposed on the operator during the treatment can largely be reduced.

It is to be noted that the threshold value Z1 is the rise value, but the timing to switch to the heat energy may be set to the lowermost point or so of the impedance at which the destruction of the cell membrane substantially ends.

Moreover, in this embodiment, the treatment has been described in which the high-frequency energy is introduced into the living tissue L_(T), and then the heat energy is applied. However, the heat energy may be introduced simultaneously with or prior to the high-frequency energy to such an extent that the denaturation of the protein is not caused. However, it is not appropriate to supply the heat energy which causes the protein denaturation (the denaturation, coagulation or the like of the surface tissue) before supplying the treatment high-frequency energy for treating the living tissue, because the appropriate high-frequency energy is not easily introduced into the living tissue.

Furthermore, in this embodiment, it is judged in STEP 6 of FIG. 4 whether the value of the impedance Z is the threshold value Z2 or more, and the output of the high-frequency energy and heat energy is stopped. Separately, with the elapse of time after shifting to STEP 5, for example, with the elapse of 30 seconds (predetermined time t) after starting the output of the heat generation element set temperature Tset [° C.] in STEP 5, the output of the high-frequency energy and heat energy may automatically be stopped. That is, instead of judging the change of the impedance Z, it is preferable to switch the treatment from the treatment using the high-frequency energy to the treatment using the heater member 54 after the elapse of the predetermined time t or to set the state of the treatment by use of the display panels 100, 108 in accordance with the elapse of time so that the treatment is ended. It is further preferable to set both the impedance Z and the time by use of the display panels 100, 108 so that one of the impedance and the time whose treatment earlier ends is appropriately selected. The treatment may be ended, for example, at a time when the value of the impedance Z reaches the threshold value Z2 before the predetermined time t elapses, or the treatment may be ended at a time when the predetermined time t elapses before the value of the impedance Z reaches the threshold value Z2.

Here, it has been described that as shown in FIG. 3A, the bipolar surgical treatment instrument 12 having the electrodes 52 a, 52 b provided on the jaws 36 a, 36 b, respectively, and having different potentials is used in performing the high-frequency energy treatment, but as shown in FIG. 3B, a monopolar surgical treatment instrument for performing the high-frequency energy treatment may preferably be used. In this case, a return electrode plate 130 is attached to a patient P to be treated. This return electrode plate 130 is connected to an energy source 14 via an energization line 132. Furthermore, an electrode 52 a provided on one jaw 36 a and an electrode 52 b provided on the other jaw 36 b have an equal potential state in which first and second power supply lines 62 a, 62 b are electrically connected. In this case, the areas of a living tissue L_(T) which come in contact with the first and second high-frequency electrodes 52 a, 52 b are small, respectively, so that a current density is high, but the current density of the return electrode plate 130 lowers. Therefore, the living tissue L_(T) grasped between the jaws 36 a and 36 b is heated, whereas the living tissue L_(T) which comes in contact with the return electrode plate 130 is heated less to a negligible degree. Therefore, the only portions of the living tissue L_(T) that are grasped between the jaws 36 a and 36 b and that come in contact with the electrodes 52 a, 52 b are heated and denatured.

Moreover, although not shown, the high-frequency electrode may preferably be provided on the only one of the jaws 36 a, 36 b in a case where the monopolar surgical treatment instrument is used.

Furthermore, it is also preferable to set the output conditions of the surgical treatment instrument 12 (the set power Pset [W] of the high-frequency energy output, the set temperature Tset [° C.] of the heat energy output, the threshold values T1, T2 of the set temperature Tset of the living tissue L_(T), etc.).

First Modification of First Embodiment

Next, a first modification will be described with reference to FIGS. 5A and 5B. This modification is the modification of the first embodiment, and the description of the same members as those described in the first embodiment or members producing the same function as that of the first embodiment is omitted. This hereinafter applies to second to fourth modifications.

In the above first embodiment, it has been described that the change of the impedance Z is measured to judge the state of the living tissue L_(T), but a phase change (a phase difference Δθ) may be judged to switch a treatment from a treatment using high-frequency energy to a treatment using a heat generation element or to end the treatment. In this case, the sensor 98 shown in FIG. 2 includes a voltage detecting section 142, a current detecting section 144 and a phase detecting section 146 as shown in FIG. 5A.

When a high-frequency voltage is generated from a variable voltage source 94 through a power amplifier 96, a high-frequency current having a predetermined frequency and a peak value based on the high-frequency voltage transmitted through the power amplifier 96 is output to a surgical treatment instrument 12 via the current detecting section 144. The voltage detecting section 142 detects the peak value of the high-frequency voltage transmitted through the power amplifier 96, and the detected peak value is output as output voltage value information to the phase detecting section 146. The current detecting section 144 detects the peak value of the high-frequency current generated based on the high-frequency voltage transmitted through the power amplifier 96, and outputs the detected peak value as output current value information to the phase detecting section 146.

The phase detecting section 146 detects the phase of the high-frequency voltage output through the power amplifier 96 based on the output voltage value information output from the voltage detecting section 142, and then outputs, to an output control section 92, the detected phase as output voltage phase information together with the output voltage value information. The phase detecting section 146 detects the phase of the high-frequency current transmitted through the power amplifier 96 based on the output current value information output from the current detecting section 144, and then outputs, to the output control section 92, the detected phase as output current phase information together with the output current value information.

The output control section 92 calculates the phase difference Δθ between the high-frequency voltage and the high-frequency current output through the power amplifier 96 based on the output voltage value information, the output voltage phase information, the output current value information and the output current phase information output from the phase detecting section 146.

The output control section 92 performs control to change the output state of the high-frequency current and the high-frequency voltage to an ON-state or OFF-state with respect to the variable voltage source 94 and power amplifier 96 based on an instruction signal output in accordance with the operation of a pedal 16 a of a foot switch 16, and the calculated phase difference Δθ.

As shown in FIG. 5B, the phase difference Δθ between the high-frequency current and the high-frequency voltage output through the power amplifier 96 is 0° or substantially 0° in an initial stage in which the living tissue L_(T) is treated. It is to be noted that the value of the phase difference Δθ is set to 90° or a value close to 90° in a display panel 100.

When the pedal 16 a of the foot switch 16 is continuously pressed and the treatment of the living tissue L_(T) grasped between electrodes 52 a and 52 b of jaws 36 a and 36 b proceeds, a water content is removed from the living tissue L_(T), and the tissue L_(T) is cauterized or coagulated. When the treatment proceeds in this manner, the phase difference Δθ between the high-frequency voltage and the high-frequency current output through the power amplifier 96 increases from the state of 0° or substantially 0° at, for example, appropriate time t1.

Afterward, when the pedal 16 a of the foot switch 16 is further continuously pressed and the treatment of a desired portion proceeds, the value of the phase difference Δθ calculated by the output control section 92 has a constant value around 90° shown in FIG. 5B, for example, after time t2.

Here, it is assumed that the threshold value of the phase difference Δθ is set to the value close to 90° in the display panel 100. In consequence, the output control section 92 reduces the output of high-frequency energy to provide monitor output, and transmits a signal to an output control section 102 of a heat generation element driving circuit 74, whereby energy is supplied from an output section 104 to a heater member 54, thereby allowing the heater member 54 to generate heat. At this time, when predetermined time (time from the time t2 to the end of the treatment) is set in, for example, an operation display panel 108, a series of treatments end even in a state in which the pedal 16 a of the foot switch 16 is continuously pressed.

It is to be noted that in this modification, the output control section 92 may not only perform the above control in a case where it is detected that the phase difference Δθ is the constant value around 90° but also perform the above control, for example, in a case where it is detected that the phase difference Δθ becomes constant at a predetermined value which is larger than 45° and which is 90° or less.

Moreover, both the change of the impedance Z and the change of the phase may be combined to switch the energy to be introduced into the living tissue L_(T). That is, with regard to the change of the impedance Z and the change of the phase, it is also preferable that one of the impedance and the phase which reaches the threshold value earlier or later is appropriately set and used in the display panels 100, 108. Furthermore, to switch the energy to be introduced into the living tissue L_(T), the energy may be switched from the high-frequency energy to heat energy, or the energy may be switched so that the heat energy is output together with the high-frequency energy.

It is to be noted that in the following modifications and embodiments, an example will mainly be described in which the high-frequency energy or the heat energy is switched using the changes of the threshold values Z1, Z2 of the impedance Z, but the output of the high-frequency energy or heat energy may be switched using the phase difference Δθ. Alternatively, the changes of the impedance Z and phase difference Δθ may be combined to switch the output of the high-frequency energy or heat energy.

Second Modification of First Embodiment

Next, a second modification will be described with reference to FIG. 6.

An operator operates operation display panels 100, 108 in advance to set the output conditions of a surgical treatment instrument 12 (a set power Pset [W] of high-frequency energy output, a set temperature Tset [° C.] of heat energy output, threshold values Z1, Z2 of the set power Pset, etc.).

FIG. 6 shows one example of the control flow of the surgical treatment instrument 12 controlled by a high-frequency energy driving circuit 72 and a heat generation element driving circuit 74.

First, an output control section 92 of the high-frequency energy driving circuit 72 judges whether or not a foot switch 16 has been turned on by operator's operation (STEP 11).

In a case where it is judged that the switch 16 has been turned on, high-frequency energy is output to a living tissue L_(T) between electrodes 52 a and 52 b of jaws 36 a and 36 b of the surgical treatment instrument 12, and a heater member 54 is allowed to generate heat (STEP 12).

Then, the set power Pset [W] preset by the operation display panel 100, for example, a power of, for example, about 20 [W] to 80[W] is supplied between the electrodes 52 a and 52 b of the jaws 36 a and 36 b, and the monitor output of the heater member 54 is started (STEP 13). The monitor output indicates that the energy is applied to such a level that the living tissue L_(T) is not treated to allow the heater member 54 to generate the heat. A sensor 106 monitors a temperature T of the heater member 54 in accordance with such monitor output. Then, the outline of the temperature change of the living tissue L_(T) transmitted from the living tissue L_(T) between the jaws 36 a and 36 b through the electrode 52 b can be monitored. That is, the heater member 54 is allowed to function as a temperature sensor, and the cauterizing of the living tissue L_(T) grasped between the jaws 36 a and 36 b is started by the high-frequency energy supplied from the high-frequency energy driving circuit 72.

An output control section 102 of the heat generation element driving circuit 74 judges whether the temperature T calculated based on a signal from the sensor 106 (the temperature of the heat conducted from the living tissue L_(T) through the electrode 52 b) is a preset threshold value T1 (e.g., 100° C.) or more (STEP 14). In a case where it is judged that the temperature T is lower than the preset threshold value T1, processing is returned to STEP 13. On the other hand, in a case where it is judged that the temperature T is the preset threshold value T1 or more, the output control section 102 of the heat generation element driving circuit 74 transmits a signal to the output control section 92 of the high-frequency energy driving circuit 72 via a communication cable 82. The output control section 92 reduces the high-frequency energy output to switch the output to the monitor output. A sensor 98 can monitor the change of the impedance Z of the living tissue L_(T) between the jaws 36 a and 36 b in accordance with the monitor output. Then, the output control section 102 of the heat generation element driving circuit 74 supplies the energy to the heater member 54 so that the temperature of the heater member 54 is a preset temperature Tset [° C.], for example, a temperature of 100[° C.] to 300[° C.] (STEP 15). Therefore, the living tissue L_(T) grasped between the jaws 36 a and 36 b conducts the heat to the second electrode 52 b owing to the heat conduction from the heater member 54, and the heat coagulates the living tissue L_(T) internally from the side of the front surface of the living tissue L_(T) which comes in close contact with the second electrode 52 b.

Subsequently, the output control section 92 judges whether the impedance Z of the living tissue L_(T) monitored in accordance with the monitor output is the preset threshold value Z2 or more (STEP 16). In a case where it is judged that the impedance Z is smaller than the threshold value Z2, the processing is returned to STEP 15. On the other hand, in a case where it is judged that the value of the impedance Z is the threshold value Z2 or more, the output control sections 92, 102 stop the output of the high-frequency energy and heat energy (STEP 17). In consequence, the treatment of the living tissue L_(T) is completed.

Third Modification of First Embodiment

Next, a third modification will be described with reference to FIG. 7. In this modification, a heater member 54 is used as a temperature sensor.

FIG. 7 shows one example of the control flow of a surgical treatment instrument 12 controlled by a high-frequency energy output circuit 72 and a heat generation element driving circuit 74. Here, the processing of STEP 21 to STEP 24 is the same as that of the second modification shown in FIG. 6. That is, STEP 21 of FIG. 7 corresponds to STEP 11 of FIG. 6, STEP 22 corresponds to STEP 12, STEP 23 corresponds to STEP 13, and STEP 24 corresponds to STEP 14. It is judged in STEP 24 whether a temperature T of a living tissue L_(T) is a preset threshold value T1 (e.g., T1 is about 100° C.) or more. In a case where it is judged that the temperature T is lower than the threshold value T1, processing is returned to STEP 23. In a case where it is judged that the temperature T is the threshold value T1 or more, the processing shifts to STEP 25 to complete the treatment of the living tissue L_(T).

Fourth Modification of First Embodiment

Next, a fourth modification will be described with reference to FIG. 8. This modification is an example in which unlike the heat generation element driving circuit 74 described in the first embodiment, a temperature sensor (not shown) is provided separately from a heater member 54. That is, in this modification, the heater member 54 is not used as the temperature sensor and, for example, the temperature of a living tissue L_(T) is measured by another temperature sensor. The heater member 54 is formed of a material such as Ni—Cr or Fe—Cr. A temperature sensor such as a thermistor or a thermocouple is provided in the vicinity of the heater member 54.

The heat generation element driving circuit 74 is provided with an output section 104 which supplies a power for allowing the heater member 54 to generate heat. The output section 104 is connected to a surgical treatment instrument 12 via a connection cable 24 a for heat energy output. The heat generation element driving circuit 74 is also provided with a sensor 106. The sensor 106 is connected to the temperature sensor provided separately from the heater member 54 of the surgical treatment instrument 12 via a connection cable 24 b for the temperature sensor. Therefore, the sensor 106 transmits a signal indicating a temperature T of the heater member 54 to an output control section 102 based on a signal from the temperature sensor provided separately from the heater member 54. The output control section 102 sends a signal to the output section 104 based on the signal from the sensor 106. In consequence, the output control of the heater member 54 is performed.

Second Embodiment

Next, a second embodiment will be described with reference to FIGS. 9 to 15. This embodiment is the modification of the first embodiment.

Here, as the example of an energy treatment instrument (a treatment instrument), a linear surgical treatment instrument 212 for performing a treatment through, for example, an abdominal wall will be described.

As shown in FIG. 9, a treatment system 210 includes the energy treatment instrument 212, an energy source 214 and a foot switch 216.

The energy treatment instrument 212 includes a handle 222, a shaft 224 and an openable/closable holding section 226. The handle 222 is connected to the energy source 214 via a cable 228. The energy source 214 is connected to the foot switch (may be a hand switch) 216 having a pedal 216 a. In consequence, the pedal 216 a of the foot switch 216 is operated by an operator to turn on/off the supply of energy from the energy source 214 to the surgical treatment instrument 212.

The handle 222 is formed into such a shape that the operator easily holds the handle, and is substantially formed into an L-shape. One end of the handle 222 is provided with the shaft 224. The cable 228 extends from the proximal end of the handle 222 disposed coaxially with respect to this shaft 224.

On the other hand, the other end side of the handle 222 is a grasping section to be grasped by the operator. The handle 222 is provided with a holding section opening/closing knob 232 so that the knob 232 is arranged on the other end side of the handle. The holding section opening/closing knob 232 is connected to the proximal end of a sheath 244 (see FIGS. 10A and 10B) of the shaft 224 in the substantially middle portion of the handle 222 as described later. When the holding section opening/closing knob 232 comes close to or away from the other end of the handle 222, the sheath 244 moves along the axial direction of the sheath. The handle 222 further includes a cutter driving knob 234 for moving a cutter 254 described later in a state in which the knob 234 is arranged in parallel with the holding section opening/closing knob 232.

As shown in FIGS. 10A and 10B, the shaft 224 includes a cylindrical member 242, and the sheath 244 slidably arranged outside the cylindrical member 242. The proximal end of the cylindrical member 242 is fixed to the handle 222 (see FIG. 9). The sheath 244 is slidable along the axial direction of the cylindrical member 242.

A recessed portion 246 is formed along the axial direction of the cylindrical member 242 outside the cylindrical member 242. The recessed portion 246 is provided with a first high-frequency electrode energization line 266 b connected to a first high-frequency electrode (an output section) 266 described later, and a heater member energization line 268 a connected to a heater member 268. A high-frequency electrode energization line 270 b connected to a second high-frequency electrode (an output section) 270 described later is inserted through the cylindrical member 242.

A driving rod 252 is arranged in the cylindrical member 242 of the shaft 224 so that the rod 252 can move along the axial direction thereof. The distal end of the driving rod 252 is provided with the thin-plate-like cutter (an auxiliary treatment instrument) 254. Therefore, when the cutter driving knob 234 is operated, the cutter 254 moves via the driving rod 252.

The distal end of the cutter 254 is provided with a blade 254 a, and the distal end of the driving rod 252 is fixed to the proximal end of the cutter 254. A long groove 254 b is formed between the distal end of the cutter 254 and the proximal end thereof. In this long groove 254 b, a movement regulation pin 256 extending in a direction crossing the axial direction of the shaft 224 at right angles is fixed to the cylindrical member 242 of the shaft 224. Therefore, the long groove 254 b of the cutter 254 moves along the movement regulation pin 256. In consequence, the cutter 254 moves straight. At this time, the cutter 254 is provided in cutter guide grooves (channels, fluid discharge grooves) 262 a, 264 a of a first holding member 262 and a second holding member 264 described later.

It is to be noted that engagement portions 254 c which engage with the movement regulation pin 256 to control the movement of the cutter 254 are formed in at least three portions, that is, in one end and the other end of the long groove 254 b of the cutter 254 and between the one end and the other end.

As shown in FIGS. 9, 10A and 10B, the holding section 226 is provided on the distal end of the shaft 224. As shown in FIGS. 10A and 10B, the holding section 226 includes the first holding member (a first jaw) 262 and the second holding member (a second jaw) 264.

The first holding member 262 and the second holding member 264 themselves preferably entirely have insulation properties, respectively. The first holding member 262 is integrally provided with a first holding member main body (hereinafter referred to mainly as the main body) 272 and a base portion 274 provided on the proximal end of the main body 272. The first holding member main body 272 and the base portion 274 are provided with the cutter guide groove 262 a for guiding the cutter 254. Then, the main body 272 is provided with the first high-frequency electrode 266 and the heater member 268. That is, the first holding member 262 is provided with the first high-frequency electrode 266 and the heater member 268 as an output member and an energy release section.

As shown in FIGS. 10A to 12, the main body 272 of the first holding member 262 is provided with a recessed portion 272 a and a holding face 272 b including the edge of the recessed portion 272 a. The first high-frequency electrode 266 is arranged in the recessed portion 272 a. The front surface of the first high-frequency electrode 266 and the holding face 272 b are different surfaces. The holding face 272 b is arranged closer to a main body 276 of the facing second holding member 264 than the front surface of the first high-frequency electrode 266 is, and the holding face abuts on a holding face 276 b of the main body 276 of the facing second holding member 264.

The first high-frequency electrode 266 is electrically connected to a first electrode connector 266 a. The first electrode connector 266 a is connected to the cable 228 extending from the handle 222 via the energization line 266 b for the first high-frequency electrode 266. The heater member 268 is connected to the cable 228 extending from the handle 222 via the energization line 268 a for the heater member 268. The main body 276 of the second holding member 264 is provided with the second high-frequency electrode 270. The second high-frequency electrode 270 is electrically connected to a second electrode connector 270 a. The second electrode connector 270 a is connected to the cable 228 extending from the handle 222 via the energization line 270 b for the second high-frequency electrode 270.

As shown in FIGS. 11A and 12, the first high-frequency electrode 266 is continuously formed into, for example, a substantial U-shape so that the electrode 266 has two ends in the proximal end of the main body 272 of the first holding member 262. In consequence, the first high-frequency electrode 266 is provided with the cutter guide groove (conveniently denoted with symbol 262 a) which guides the cutter 254 together with the first holding member 262.

The heater members 268 are provided on the back surface of the first high-frequency electrode 266 in a discrete manner. At this time, portions between the first high-frequency electrode 266 and the heater members 268 are insulated. Subsequently, when the heater member 268 generates heat, the heat is conducted to the first high-frequency electrode 266. In consequence, the living tissue L_(T) which comes in contact with the first high-frequency electrode 266 is cauterized.

It is to be noted that the insulating main body 272 of the first holding member 262 preferably covers the outer periphery of the heater member 268, and has an insulation property. According to such a structure, when the heat generated by the heater member 268 is conducted to the first high-frequency electrode 266, the heat can be conducted in a state in which a heat loss is reduced.

The second holding member 264 integrally includes the second holding member main body 276 and a base portion 278 provided on the proximal end of the main body 276. The second holding member main body 276 and the base portion 278 are provided with the cutter guide groove 264 a for guiding the cutter 254. The second main body 276 is provided with the second high-frequency electrode 270. That is, the second holding member 264 is provided with the second high-frequency electrode 270 as an output member or an energy release member.

Although not shown, the second high-frequency electrode 270 is continuously formed into, for example, a substantial U-shape (the same shape) symmetrically with the first high-frequency electrode 266 shown in FIG. 11A so that the electrode 270 has two ends in the proximal end of the main body 276 of the second holding member 264. In consequence, the second high-frequency electrode 270 is provided with the cutter guide groove (conveniently denoted with symbol 264 a) which guides the cutter 254.

It is to be noted that the cutter guide grooves 262 a, 264 a of the first and second holding members 262, 264 are formed in a state in which the grooves 262 a, 264 a face each other, and the grooves 262 a, 264 a are formed along the axial direction of the shaft 224. Then, the two cutter guide grooves 262 a, 264 a can guide one cutter 254.

The cylindrical member 242 and the sheath 244 of the shaft 224 of the energy treatment instrument 212 shown in FIGS. 10A and 10B are provided with fluid discharge ports 242 a, 244 a via which a fluid such as vapor (a gas) or a liquid (a tissue liquid) described later is discharged. These fluid discharge ports 242 a, 244 a are formed in the proximal end of the shaft 224.

Here, although not shown, the outer peripheral surface of the fluid discharge port 244 a of the sheath 244 is preferably provided with a connection mouthpiece. At this time, the fluid described later is discharged through the cutter guide grooves 262 a, 264 a, the fluid discharge port 242 a of the cylindrical member 242 of the shaft 224, the fluid discharge port 244 a of the sheath 244 of the shaft 224 and the connection mouthpiece. In this case, a fluid such as the vapor or the liquid discharged from the living tissue L_(T) is sucked from the connection mouthpiece, whereby the fluid can easily be discharged from the fluid discharge ports 242 a, 244 a.

It is to be noted that the fluid discharge ports 242 a, 244 a are preferably provided in the shaft 224, but may preferably be provided in the handle 222 instead of the shaft 224.

The base portion 274 of the first holding member 262 is fixed to the distal end of the cylindrical member 242 of the shaft 224. On the other hand, the base portion 278 of the second holding member 264 is rotatably supported on the distal end of the cylindrical member 242 of the shaft 224 by a support pin 280 arranged in a direction crossing the axial direction of the shaft 224 at right angles. The second holding member 264 can rotate around the axis of the support pin 280 to open and close with respect to the first holding member 262. The second holding member 264 is urged by an elastic member 280 a such as a leaf spring so that the second holding member opens with respect to the first holding member 262.

The outer surfaces of the main bodies 272, 276 of these first and second holding members 262, 264 are formed into a smoothly curved shape. Similarly, the outer surfaces of the base portions 274, 278 of these first and second holding members 262, 264 are also formed into a smoothly curved shape. In a state in which the second holding member 264 is closed with respect to the first holding member 262, the sections of the main bodies 272, 276 of the respective holding members 262, 264 are formed into a substantially circular or elliptic shape. In a state in which the second holding member 264 is closed with respect to the first holding member 262, the holding faces 272 b, 276 b of the main bodies 272, 276 of the first and second holding members 262, 264 face each other, and the base portions 274, 278 are formed into a cylindrical shape. In this state, the diameter of the proximal ends of the main bodies 272, 276 of the first and second holding members 262, 264 is formed to be larger than the diameter of the base portions 274, 278. Then, stepped portions 282 a, 282 b are formed between the main bodies 272, 276 and the base portions 274, 278, respectively.

Here, with regard to the first holding member 262 and the second holding member 264, in a state in which the second holding member 264 is closed with respect to the first holding member 262, the outer peripheral surface of the substantially circular or elliptic shape obtained by combining the base portions 274, 278 of the holding members is formed as substantially the same plane as the outer peripheral surface of the distal end of the cylindrical member 242 or formed with a diameter slightly larger than that of the outer peripheral surface. In consequence, the sheath 244 is slid with respect to the cylindrical member 242, whereby the distal end of the sheath 244 can cover the base portions 274, 278 of the first holding member 262 and the second holding member 264. In this state, as shown in FIG. 10A, the first holding member 262 and the second holding member 264 close against the urging force of the elastic member 280 a. On the other hand, in a case where the sheath 244 is slid toward the proximal end of the cylindrical member 242 from a state in which the distal end of the sheath 244 covers the base portions 274, 278 of the first holding member 262 and the second holding member 264, as shown in FIG. 10B, the second holding member 264 opens with respect to the first holding member 262 owing to the urging force of the elastic member 280 a.

Moreover, in this embodiment, a space between the proximal ends of the first high-frequency electrode 266 and a space between the proximal ends of the second high-frequency electrode 270 are formed to be approximately equal to the sizes of the widths of the cutter guide grooves 262 a, 264 a of the first holding member 262 and the second holding member 264, respectively (see FIG. 12). However, the space between the proximal ends of the first high-frequency electrode 266 and the space between the proximal ends of the second high-frequency electrode 270 may appropriately be set, respectively. That is, the first and second high-frequency electrodes 266, 270 may be provided away from the edges of the cutter guide grooves 262 a, 264 a of the first holding member 262 and the second holding member 264.

As shown in FIG. 13, in the energy source 214, a control section 290, a high-frequency energy output circuit 292, a heat generation element driving circuit 294, a display section 296 and a speaker 298 are arranged. The control section 290 is connected to the high-frequency energy output circuit 292, the heat generation element driving circuit 294, the display section 296 and the speaker 298, and the control section 290 controls these components. Then, the high-frequency energy driving circuit 292 is connected to the heat generation element driving circuit 294 via the control section 290. The control section 290 is connected to the foot switch 216. When the foot switch 216 is turned on, the energy treatment instrument 212 performs a treatment. When the switch is turned off, the treatment stops. The display section 296 functions as setting means of the control section 290.

It is to be noted that although not shown, the high-frequency energy output circuit (a high-frequency energy output section) 292 outputs the high-frequency energy, and can detect an impedance Z as described in the first embodiment (see FIG. 2). That is, the high-frequency energy output circuit 292 has a sensor function for measuring the impedance Z of the living tissue L_(T) between the first high-frequency electrode 266 and the second high-frequency electrode 270 of the energy treatment instrument 212.

Moreover, although not shown here (see FIG. 2), the heat generation element driving circuit 294 supplies the energy to the heater member 268 to allow the heater member 268 to generate the heat, and the circuit 294 has a sensor function for measuring a heat generation temperature T of the heater member 268.

Next, the operation of the treatment system 210 according to this embodiment will be described.

An operator operates the display section 296 of the energy source 214 in advance to set the output conditions of the treatment system 210. Specifically, a set power Pset [W] of high-frequency energy output, a set temperature Tset [° C.] of heat energy output, threshold values Z1, Z2 of the impedance Z of the living tissue L_(T) and the like are set.

As shown in FIG. 10A, in a state in which the second holding member 264 is closed with respect to the first holding member 262, the holding section 226 and the shaft 224 of the surgical treatment instrument 212 are inserted into, for example, an abdominal cavity through an abdominal wall. The holding section 226 of the surgical treatment instrument 212 is opposed to the living tissue L_(T) as a treatment target.

To hold the living tissue L_(T) as the treatment target between the first holding member 262 and the second holding member 264, the holding section opening/closing knob 232 of the handle 222 is operated. At this time, with respect to the cylindrical member 242, the sheath 244 is moved to the proximal end of the shaft 224. A cylindrical portion between the base portions 274 and 278 cannot be maintained owing to the urging force of the elastic member 280 a, whereby the second holding member 264 opens with respect to the first holding member 262.

The living tissue L_(T) as the treatment target is arranged between the first high-frequency electrode 266 of the first holding member 262 and the second high-frequency electrode 270 of the second holding member 264. In this state, the grasping section opening/closing knob 232 of the handle 222 is operated. At this time, with respect to the cylindrical member 242, the sheath 244 is moved to the distal end of the shaft 224. The base portions 274, 278 are closed against the urging force of the elastic member 280 a by the sheath 244 to form the cylindrical portion between the base portions. In consequence, the main body 272 of the first holding member 262 formed integrally with the base portion 274 and the main body 276 of the second holding member 264 formed integrally with the base portion 278 close. That is, the second holding member 264 closes with respect to the first holding member 262. Thus, the living tissue L_(T) as the treatment target is grasped between the first holding member 262 and the second holding member 264.

At this time, the living tissue L_(T) as the treatment target comes in contact with both the first high-frequency electrode 266 provided on the first holding member 262 and the second high-frequency electrode 270 provided on the second holding member 264. The peripheral tissue of the living tissue L_(T) as the treatment target comes in close contact with both the facing contact faces of the edge of the holding face 272 b of the first holding member 262 and the edge (not shown) of the holding face 276 b of the second holding member 264.

FIG. 14 shows one example of the control flow of the surgical treatment instrument 212 controlled by the high-frequency energy output circuit 292 and the heat generation element driving circuit 294.

The foot switch 216 is operated in a state in which the living tissue is grasped between the first holding member 262 and the second holding member 264. The control section 290 of the energy source 214 judges whether or not the switch 216 is turned on by operator's operation (STEP 41). When the foot switch 216 is turned on, the high-frequency energy output circuit 292 of the energy source 214 supplies the energy to the living tissue L_(T) between the first high-frequency electrode 266 and the second high-frequency electrode 270 via the cable 228 (STEP 42). Then, the set power Pset [W] preset in the display section 296, for example, a power of about 20 [W] to 80 [W] is supplied between the electrodes 266 and 270 of the first and second holding members 262, 264.

In consequence, a high-frequency current flows through the living tissue L_(T) grasped between the first holding member 262 and the second holding member 264, and the living tissue L_(T) is allowed to generate heat to start the cauterizing of the tissue (the denaturing of the tissue). At this time, the impedance Z of the grasped living tissue L_(T) is measured by the high-frequency energy output circuit 292. The impedance Z at a time of treatment start is, for example, about 60 [Ω] as shown in FIG. 15. Subsequently, when the high-frequency current flows through the living tissue L_(T) to cauterize the living tissue L_(T), the value of the impedance Z rises.

When the living tissue L_(T) is cauterized in this manner, a fluid (e.g., a liquid (blood) and/or the gas (water vapor)) is discharged from the living tissue L_(T). At this time, the holding faces 272 b, 276 b of the first and second holding members 262, 264 come in closer contact with the living tissue L_(T) than the electrodes 266, 270. Therefore, the holding faces 272 b, 276 b function as a barrier portion (a dam) which inhibits the fluid from being released from the first and second holding members 262, 264. Therefore, the fluid discharged from the living tissue L_(T) is allowed to flow into the cutter guide grooves 262 a, 264 a disposed internally from the electrodes 266, 270, and the fluid is sucked to flow from the first and second holding members 262, 264 to the shaft 224. While the fluid is discharged from the living tissue L_(T), the fluid is allowed to continuously flow into the cutter guide grooves 262 a, 264 a. In consequence, it is prevented that thermal spread is caused by the fluid discharged from the living tissue L_(T) in a state in which the temperature rises, and it can be prevented that a portion which is not the treatment target is influenced.

Subsequently, the control section 290 judges whether the impedance Z during the high-frequency energy output calculated based on the signal from the high-frequency energy output circuit 292 is the preset threshold value Z1 (here, about 1000 [Ω] as shown in FIG. 15) or more (STEP 43). The threshold value Z1 is in such a position that the rise ratio of the value of the impedance Z known in advance becomes dull. Then, in a case where it is judged that the impedance Z is smaller than the threshold value Z1, processing is returned to STEP 42. That is, the high-frequency energy for the treatment is continuously applied to the living tissue L_(T) grasped between the electrodes 266 and 270 of the first and second holding members 262, 264.

In a case where it is judged that the impedance Z becomes larger than the threshold value Z1, the control section 290 transmits a signal to the heat generation element driving circuit 294. Then, the heat generation element driving circuit 294 supplies a power to the heater member 268 so that the temperature of the heater member 268 is a preset temperature Tset [° C.], for example, a temperature of 100[° C.] to 300[° C.] (STEP 44). In consequence, the living tissue L_(T) grasped between the electrodes 266 and 270 of the first and second holding members 262, 264 conducts the heat to the first electrode 266 owing to the heat conducted from the heater member 268, and the heat coagulates the living tissue L_(T) internally from the side of the front surface of the living tissue L_(T) which comes in close contact with the first electrode 266.

As described above, when it is judged that the impedance Z becomes larger than the threshold value Z1, the control section 290 transmits the signal to the heat generation element driving circuit 294 to start driving the heater member 268. In the heat generation element driving circuit 294, the temperature of the heater member 268 can be detected by supplying a weak current. Consequently, to shift from the high-frequency energy output by the electrodes 266 and 270 to the heat energy output by the heater member 268, a detection result of the high-frequency energy output circuit 292 is not only used, but the detection results of the temperature and the impedance Z may be combined to shift from the high-frequency energy output to the heat energy output by the heater member 268.

For example, when the temperature of the heater member 268 is 100[° C.] or higher and the impedance Z is 500 [Ω] or more, the driving with the high-frequency energy can be switched to the driving with the heat energy by the heater member 268.

In this way, owing to the holding section 226 of the treatment instrument 212, the control section 290 can combine the detection results of the impedance Z and the temperature to perform judgment for changing the energy output during control. Consequently, the treatment system 210 can perform the detection in view of the situation of the living tissue L_(T) in more detail, which enables detailed control concerning the energy output and control strongly against noises.

Subsequently, the control section 290 judges whether the impedance Z of the living tissue L_(T) monitored by the high-frequency energy output circuit 292 is a preset threshold value Z2 (here, about 2000 [Ω] as shown in FIG. 15) or more (STEP 45). In a case where it is judged that the impedance Z is smaller than the threshold value Z2, the processing is returned to STEP 44. On the other hand, in a case where it is judged that the impedance Z is the threshold value Z2 or more, the control section 290 issues a buzzer sound from the speaker 298 (STEP 46), and stops the output of high-frequency energy and heat energy (STEP 47). In consequence, the treatment of the living tissue L_(T) by use of the treatment system 210 is completed.

As described above, according to this embodiment, the following effect is obtained. The description of the effect described in the first embodiment is omitted.

The fluid (a water content, vapor) generated at a time when the high-frequency energy is applied to the living tissue L_(T) to destroy the cell membrane of the living tissue L_(T) and/or a time when the heat energy is applied to cauterize the living tissue L_(T) can be guided to the cutter guide grooves 262 a, 264 a. The fluid is guided to these cutter guide grooves 262 a, 264 a, whereby the fluid generated from the living tissue L_(T) can be discharged from the shaft 224 or the handle 222 through the energy treatment instrument 212. In consequence, it can be prevented that the heat is applied to a living tissue L_(T) which is not related to the treatment owing to the fluid generated from the treated living tissue L_(T). That is, the fluid can be guided from the living tissue L_(T) to these cutter guide grooves 262 a, 264 a to prevent the thermal spread from being caused.

It is to be noted that in the second embodiment, the structure has been described in which to prevent the thermal spread, the holding faces 272 b, 276 b disposed externally from the first high-frequency electrode 266 are used as the barrier portion. In addition, a structure is preferable in which the holding faces 272 b, 276 b of the second embodiment are provided with, for example, a cooling plate for cooling via a cooling medium or the like, whereby the living tissue L_(T) and a fluid such as the vapor can indirectly be cooled.

In addition, as described with reference to FIG. 15A to FIG. 15C, the control section 290 of the energy source 214 can execute the control to treat the living tissue L_(T).

When the living tissue L_(T) as the treatment target grasped between the first holding member 262 and the second holding member 264, as shown in FIG. 15A, the high-frequency energy is intermittently output (output and output stop are repeated) (hereinafter referred to as a high-frequency energy intermittent output period). The high-frequency energy is thus intermittently output, whereby the rapid temperature rise of the living tissue L_(T) due to the continuous output of the high-frequency energy can be suppressed as described later.

In the high-frequency energy intermittent output period, while outputting a monitor output V₀ as the high-frequency energy which does not influence the living tissue L_(T) in order to measure the impedance Z of the living tissue L_(T) through the first and second electrodes 266 and 270 of the first and second holding members 262 and 264, the high-frequency energy for treating the living tissue L_(T), which is larger than the monitor output V₀, is output through the first and second electrodes 266 and 270 for 50 [ms], and then the output is stopped for 50 [ms], thereby repeating such control. It is to be noted that the output time is not limited to 50 [ms], and may be a time interval of 10 [ms] or longer and 100 [ms] or shorter. The output stop time is not limited to 50 [ms], and may be controlled so as to output the next energy when keeping the state of the temperature higher than the most lowered temperature immediately after the previous energy output.

In FIG. 15A, the high-frequency energy larger than the monitor output V₀ is output through the first and second electrodes 266 and 270 for 50 [ms], i.e., the time from t1 to t2, t3 to t4, t5 to t6 or t7 to t8. As shown in FIG. 15B, in the high-frequency energy intermittent output period, when the high-frequency energy for treating the living tissue L_(T), exceeding the monitor output V₀, is output, the temperature of the grasped living tissue L_(T) rises. At this time, with the temperature rise of the living tissue L_(T), the amount of water in the living tissue can be decreased. Subsequently, when the impedance Z of the living tissue L_(T) reaches a certain set threshold value Z1, the output of the high-frequency energy exceeding the monitor output V₀ is immediately stopped.

The only monitor output V₀ is output through the first and second electrodes 266 and 270 for 50 [ms], i.e., the time from t2 to t3, t4 to t5, t6 to t7 or t8 to t9. At this time, as shown in FIG. 15B, the output of the high-frequency energy exceeding the monitor output V₀ is stopped in the high-frequency energy intermittent output period, whereby the temperature of the grasped living tissue L_(T) lowers.

As shown in FIG. 15B, the temperature of the grasped living tissue L_(T) is gradually raised while repeating the rising and lowering of the temperature of the grasped living tissue L_(T), whereby the temperature of the cells of the grasped living tissue L_(T) can moderately be raised with respect to the time as compared with a case where the high-frequency energy is continuously output to the living tissue L_(T).

Therefore, when the high-frequency energy is continuously output to the grasped living tissue L_(T), the temperature of the living tissue L_(T) continues to rise, and the rising speed of the temperature is high. If the temperature of the living tissue excessively rises, thermal spread around a treated portion is feared. In a case where the high-frequency energy is intermittently output to the grasped living tissue L_(T), the temperature takes time to rise while repeating the rising and lowering of the temperature T, as compared with a case where the energy is continuously output, whereby the temperature moderately rises. Consequently, the proteins in the destroyed cells are discharged to the outside and are easily mixed with the proteins outside the cells. Therefore, when the high-frequency energy is intermittently output, holes can be made in the cell membranes (destruction), thereby allowing the proteins to flow out of the cells. Moreover, the excessive temperature rise of the living tissue L_(T) can be suppressed. In this way, such control as to intermittently output the high-frequency energy to the grasped living tissue L_(T) can be performed to suppress the excessive temperature rise of the proteins.

Furthermore, when the temperature T of the grasped living tissue L_(T) reaches a certain predetermined temperature (a temperature threshold value) T1 (e.g., 100[° C.]), the repeated output of the high-frequency energy is stopped. At this time, the condition which the repeated output of the high-frequency energy is stopped may use not only the temperature threshold value T1 but also a combination of the temperature threshold value T1 and the impedance Z, in the latter case it is preferable that the condition is more than the temperature threshold value T1 and more than the impedance Z1. At the predetermined temperature T1, the cell membranes of the grasped living tissue L_(T) are destroyed or are easily destroyed. Subsequently, the proteins flow out of the destroyed cell membranes, the proteins inside and outside the cells are mixed, and the living tissue coagulates.

Immediately after the coagulation, the heat energy generated by the heater members 268 of the first and second holding members 262 and 264 is continuously applied to the living tissue through the first and second electrodes 266 and 270. At this time, the surfaces of the first and second electrodes 266 and 270 are heated to 100[° C.] or higher to remove water from the living tissue L_(T). Subsequently, the temperature T of the proteins inside and outside the cells is raised above the temperature T1. Consequently, the active dehydrating function of the living tissue L_(T) can be caused.

In general, the high-frequency energy is continuously applied so as to destroy the cell membranes of the living tissue L_(T) as the treatment target, thereby allowing the proteins to flow out of the cells. In this case, a current flows densely through an only certain portion of the living tissue L_(T) as the treatment target, the portion through which the current densely flows has a higher temperature than another portion, and local tissue denaturation sometimes occurs. That is, when the high-frequency energy is continuously output to the living tissue L_(T), the living tissue L_(T) does not denature uniformly, but sometimes has a non-uniform state. In the above-mentioned high-frequency energy intermittent output period, the high-frequency energy can intermittently be output as shown in FIG. 15A to moderate the temperature rise with respect to the time as shown in FIG. 15B, whereby the tissue denaturation of the living tissue L_(T) due to the local temperature rise can be suppressed and the non-uniform tissue denaturation can be suppressed. That is, the high-frequency energy can intermittently be output to substantially uniformly cause the tissue denaturation of the grasped living tissue L_(T). Moreover, as compared with a case where the high-frequency energy is continuously output to destroy the cell membranes, in a case where the high-frequency energy is intermittently output to destroy the cell membranes, the rapid and excessive temperature rise of the living tissue L_(T) can be suppressed, whereby the thermal spread around the living tissue L_(T) as the treatment target can be suppressed.

Therefore, when the living tissues L_(T) as the treatment targets are joined and treated under the control shown in FIG. 15A, the proteins inside and outside the cells are easily mixed, and the satisfactory mutually sealed state of the living tissues can be obtained, unlike a case where a flow shown in FIG. 14 is simply followed.

FIG. 15A shows a state in which the high-frequency energy intermittent output period to output the high-frequency energy has a larger energy output than the heat energy output period to output the heat energy, but the heat energy output period to output the heat energy may have larger energy, the same energy or smaller energy as compared with the high-frequency energy intermittent output period to output the high-frequency energy.

FIG. 15C shows an example in which the living tissue L_(T) is preheated before outputting the high-frequency energy for destroying the cell membranes of the living tissue L_(T) as the treatment target (high-frequency energy). That is, this preheating is a stage for a purpose of raising the temperature of the cells of the living tissue L_(T) as the treatment target approximately to a certain temperature by the high-frequency energy or the heat energy to decrease the amount of water in the living tissue L_(T).

The preheating may be performed by simultaneously using the high-frequency energy and the heat energy or by using the only high-frequency energy or the only heat energy. When the high-frequency energy is used, as shown in FIG. 15A, the high-frequency energy is preferably intermittently output.

The temperature of the grasped living tissue L_(T) is raised to the predetermined temperature by preheating the living tissue. It is to be noted that by the preheating, the temperature of the grasped living tissue L_(T) can be raised to a predetermined temperature of 100[° C.] at which vapor is generated, but the predetermined temperature is preferably from 40[° C.] to 80[° C.]. Consequently, after raising the temperature of the grasped living tissue L_(T) to a set temperature of 40[° C.] to 80[° C.] by preheating the tissue, the preheating is stopped. At this time, the set preheating temperature may be kept to decrease the amount of water in the living tissue L_(T) as much as possible.

Subsequently, the high-frequency energy is continuously or intermittently output to destroy the cell membranes, and the proteins inside and outside the cells are mixed to coagulate the living tissue.

Afterward, the living tissue (protein) is integrally denatured (coagulated) by the heat energy of the heater member 268, and the water as a factor which disturbs the welding of the proteins to each other is removed (tissue dehydration).

In general, the high-frequency energy flows in a direction in which the impedance is low. Therefore, it is predicted that when the preheating is not performed, the current density is locally increased to non-uniformly cause the thermal spread. However, when the preheating is used, the high-frequency energy is continuously output to the living tissue L_(T) after raising the temperature in the cells, whereby the rapid temperature rise of the living tissue L_(T) due to the high-frequency energy can be prevented to suppress the thermal spread.

It is to be noted that in FIG. 15C, time when any energy is not output (e.g., from several milliseconds to several tens of milliseconds) is disposed between the preheating and the high-frequency energy output and between the high-frequency energy output and the heat energy output. However, such time preferably is not disposed, and the preheating may continuously shift to the high-frequency energy output. Furthermore, the high-frequency energy output preferably continuously shifts to the heat energy output.

Moreover, when the preheating is performed as shown in FIG. 15C, control is not performed only by judging whether or not the predetermined temperature of 40[° C.] to 80[° C.] has been reached, but the impedance Z may be used in addition to or in place of the temperature T. In this case, when the impedance Z reaches the threshold value Z1 during the preheating, the energy output is stopped at this time, thereby waiting until the impedance Z decreases. Afterward, when the impedance Z decreases below the threshold value Z1, the energy is again output. Such control is repeated. When such control is performed, not only the temperature of a part of the grasped living tissue L_(T) (living tissue L_(T) in the vicinity of the surfaces of the first and second electrodes 266 and 270) but also the temperature of the whole grasped living tissue L_(T) can easily be raised to the predetermined temperature. Subsequently, immediately after raising the temperature of the whole grasped living tissue L_(T) to the predetermined temperature, the high-frequency energy is output to destroy the cell membranes.

The examples shown in FIG. 15A to FIG. 15C have been described as examples in which the change of the impedance Z is used, but the above phase difference (see FIG. 5A and FIG. 5B) may be used. The phase difference cooperates with the temperature T of the living tissue L_(T) in the same manner as in the impedance Z, and hence the temperature T of the living tissue L_(T) can be prevented from rapidly reaching the predetermined temperature (e.g., the temperature threshold value) T1.

Moreover, in this embodiment, the linear energy treatment instrument 212 (see FIG. 9) for treating the living tissue L_(T) in the abdominal cavity (in the body) through the abdominal wall has been described as the example, but as shown in, for example, FIG. 16, an open type linear energy treatment instrument (a treatment instrument) 212 a for taking a treatment target tissue from the body through the abdominal wall to treat the tissue may be used.

The energy treatment instrument 212 a includes a handle 222 and a holding section 226. That is, unlike the energy treatment instrument 212 (see FIG. 9) for treating the tissue through the abdominal wall, a shaft 224 is omitted. On the other hand, a member having a function similar to that of the shaft 224 is arranged in the handle 222. In consequence, the energy treatment instrument 212 a shown in FIG. 16 can be used in the same manner as in the energy treatment instrument 212 described above with reference to FIG. 9.

First Modification of Second Embodiment

Next, a first modification will be described with reference to FIGS. 17A and 17E. This modification is the modification of the second embodiment, and the description of the same members as those described in the second embodiment or members producing the same function as that of the second embodiment is omitted. This hereinafter applies to second to fifth modifications.

In this modification, the output configuration of energy generated from a high-frequency energy output circuit 292 and a heat generation element driving circuit 294 will be described.

In the example shown in FIG. 17A, unlike the example of the second embodiment shown in FIG. 15, the high-frequency energy output circuit 292 outputs energy, and an impedance Z of a living tissue L_(T) reaches a threshold value Z1. Afterward, the high-frequency energy is output every predetermined time to measure the impedance Z of the living tissue L_(T) every time.

On the other hand, when the impedance Z reaches the threshold value Z1, the heat generation element driving circuit 294 simultaneously outputs energy to a heater member 268, and heat (heat energy) is conducted from the heater member 268 to the living tissue L_(T) via an electrode 266 to treat the tissue L_(T).

Subsequently, when the impedance Z reaches a threshold value Z2, the output from the high-frequency energy output circuit 292 and heat generation element driving circuit 294 is automatically stopped to automatically end the treatment.

In the example shown in FIG. 17B, the high-frequency energy output circuit 292 outputs the energy, and the impedance Z of the living tissue L_(T) reaches the threshold value Z1. Afterward, the high-frequency energy is output as monitor output to continuously measure the change of the impedance Z.

On the other hand, the high-frequency energy output circuit 292 outputs the energy to the heater member 268, and the heat generation element driving circuit 294 simultaneously outputs the energy to the heater member 268. The output at this time is monitor output for a purpose of measuring the temperature of the living tissue L_(T). Subsequently, when the impedance Z reaches the threshold value Z1, the heat generation element driving circuit 294 simultaneously outputs the energy for the treatment to the heater member 268, and the heater member 268 is allowed to generate the heat. Then, the heat energy is conducted from the heater member 268 to the living tissue L_(T) through the electrode 266 to treat the tissue L_(T). At this time, the temperature of the living tissue L_(T) can also be measured.

Subsequently, when the impedance Z reaches the threshold value Z2, the output from the high-frequency energy output circuit 292 and heat generation element driving circuit 294 is automatically stopped to automatically end the treatment.

In the example shown in FIG. 17C, the high-frequency energy output circuit 292 outputs the energy, and the impedance Z of the living tissue L_(T) reaches the threshold value Z1. Afterward, the high-frequency energy is output as the monitor output to continuously measure the change of the impedance Z.

On the other hand, it is predicted that the impedance Z reaches the threshold value Z1. Immediately before the impedance reaches the threshold value Z1, the energy is output from the heat generation element driving circuit 294 to the heater member 268, and the heat is conducted from the heater member 268 to the living tissue L_(T) via the electrode 266 to treat the tissue L_(T). At this time, the amount of the energy to be supplied to the heater member 268 is gradually increased, and held in a constant state.

Subsequently, when the impedance Z reaches the threshold value Z2, the output from the high-frequency energy output circuit 292 and heat generation element driving circuit 294 is automatically stopped, and the treatment is automatically ended.

The example shown in FIG. 17D is an example in which before the energy is output from the high-frequency energy output circuit 292, the energy is output from the heat generation element driving circuit 294 to the heater member 268 to keep the living tissue L_(T) as the treatment target at such a temperature (T0) that protein denaturation is not caused. The temperature of the living tissue L_(T) as the treatment target is preliminarily kept in this manner, whereby the impedance Z can be lowered and stabilized. Afterward, the above-mentioned appropriate treatment is performed, so that the treatment of the living tissue L_(T) can be stabilized.

The example shown in FIG. 17E is an example in which the energy is discontinuously output from the heat generation element driving circuit 294 to the heater member 268. The energy is once preliminarily applied to the heater member 268 to output the energy from the member, before the impedance Z reaches the threshold value Z1. Afterward, when the impedance Z reaches the threshold value Z1 and then the heat generation element driving circuit 294 applies the energy to the heater member 268, the temperature of the heater member 268 can immediately be raised to a desired temperature.

Second Modification of Second Embodiment

Next, a second modification will be described with reference to FIG. 18. In this modification, another preferable configuration of a heater member 268 provided on a first holding member 262 will be described.

As shown in FIG. 18, the back surface of a first high-frequency electrode 266 arranged on a main body 272 of the first holding member 262 is provided with a heat generation resistor of a screen printed thick film, a heat generation resistor of a thin film formed by a physical vapor deposition (PVD) process or a nichrome line. In consequence, for example, a U-shaped heater member 268 which does not have any cut is fixed to the back surface of the U-shaped first high-frequency electrode 266.

In consequence, when energy is applied to the heater member 268 and heat is generated from the heater member 268, the heat is conducted from the heater member 268 to the first high-frequency electrode 266.

The heater member 268 described in this modification is not limited to the heat generation resistor of the thick or thin film or the nichrome line, and various heating elements may be used.

Third Modification of Second Embodiment

Next, a third modification will be described with reference to FIGS. 19A to 20C. In this modification, the configuration of a first holding member 262 will be described. In this modification, the configuration of a first high-frequency electrode 266 arranged on a main body 272 of the first holding member 262 will mainly be described, and a treatment using a cutter 254 will also be described.

As shown in FIGS. 19A to 19C, the main body 272 of the first holding member 262 is provided with the first high-frequency electrode 266. As shown in FIG. 19A, the first high-frequency electrode 266 includes a continuous electrode (a sealing member, a first bonding member) 302 formed continuously without any cut, and a plurality of discrete electrodes (maintaining members, second bonding members) 304 arranged outside this continuous electrode 302 in a discrete manner.

The continuous electrode 302 is continuously formed into, for example, a substantial U-shape so that the continuous electrode 302 has two ends in the proximal end of the main body 272 of the first holding member 262. A space between the proximal ends of the continuous electrode 302 is approximately the width of a cutter guide groove 262 a (see FIGS. 19A and 19C), but the space between the proximal ends of the continuous electrode 302 can appropriately be set. That is, the continuous electrode 302 may be provided away from the edge of the cutter guide groove 262 a of the first holding member 262.

A plurality of discrete electrodes 304 having the same shape are arranged at substantially equal intervals along a substantially U-shaped virtual track. The discrete electrodes 304 are formed into, for example, a circular shape. The discrete electrodes 304 are arranged so that a substantially predetermined space is made between the electrodes 304, and the respective discrete electrodes 304 are arranged as much as an appropriate distance away from the continuous electrode 302. The discrete electrodes 304 are positioned so that when a treatment is performed, the living tissue L_(T) between the discrete electrode 304 and a discrete electrode (not shown) of the second holding member 264 is allowed to denature owing to the heat, but the denaturation of the living tissue L_(T) between the discrete electrodes 304 of the first holding member 262 due to the heat and the denaturation of the living tissue between the discrete electrodes 304 and the continuous electrode 302 due to the heat are prevented as much as possible.

It is to be noted that the heater members 268 are preferably fixed to both of the continuous electrode 302 and the discrete electrodes 304 of the first holding member 262. Therefore, the non-uniformity of the heat conduction from the heater members 268 to the continuous electrode 302 and the discrete electrodes 304 can be prevented as much as possible, and the heat can be applied to the living tissue L_(T) as uniformly as possible.

The main body 272 and the base portion 274 of the first holding member 262 are provided with the cutter guide groove 262 a for guiding the cutter 254 therethrough. A main body 276 and a base portion 278 of the second holding member 264 are provided with a cutter guide groove 264 a for guiding the cutter 254 therethrough. These cutter guide grooves 262 a, 264 a are formed along the axial direction of a shaft 224. Therefore, the cutter 254 can move along the cutter guide grooves 262 a, 264 a in the first holding member 262 and the second holding member 264.

As described in the second embodiment and the second modification of the second embodiment, the heater member 268 is arranged discretely and/or continuously on the back surface of the continuous electrode 302 and/or the discrete electrode 304.

Moreover, the second holding member 264 is also provided with the second high-frequency electrode 270 symmetrically with the first holding member 262. The detailed description of this respect is omitted.

It is to be noted that although not shown, the continuous electrode of the second high-frequency electrode 270 is conveniently denoted with reference numeral 306, and the discrete electrodes are denoted with reference numeral 308 in the following description of a function.

Next, the function of the treatment system 210 according to this modification will be described.

As shown in FIG. 10A, in a state in which the second holding member 264 is closed with respect to the first holding member 262, for example, the holding section 226 and the shaft 224 of the energy treatment instrument 212 are inserted into, for example, an abdominal cavity through an abdominal wall. Then, the living tissue L_(T) as the treatment target is held between the first holding member 262 and the second holding member 264.

At this time, the living tissue L_(T) as the treatment target comes in contact with both of the first high-frequency electrode 266 provided on the first holding member 262 and the second high-frequency electrode 270 provided on the second holding member 264. The peripheral tissue of the living tissue L_(T) as the treatment target comes in close contact with both of the holding face 272 b of the main body 272 of the first holding member 262 and the holding face 276 b of the main body 276 of the second holding member 264.

When the pedal 216 a of the foot switch 216 is operated in this state, energy is supplied to the first high-frequency electrode 266 and the second high-frequency electrode 270.

The first high-frequency electrode 266 supplies a high-frequency current between the electrode and the second high-frequency electrode 270 via the living tissue L_(T) as the treatment target. In consequence, the living tissue L_(T) between the first high-frequency electrode 266 and the second high-frequency electrode 270 is heated. In this case, the living tissue L_(T) is continuously (a substantially U-shaped state) denatured by the continuous electrodes 302, 306 of the first and second high-frequency electrodes 266, 270. Furthermore, the living tissue L_(T) between these discrete electrodes 304 and 308 is discretely denatured by the discrete electrodes 304, 308 of the first and second high-frequency electrodes 266, 270.

When the pressed pedal 216 a of the foot switch 216 is maintained and the impedance Z reaches the threshold value Z1, the amount of the high-frequency energy to be supplied is reduced to switch to the monitor output, and the energy is supplied to the heater member 268 to allow the heater member 268 to generate the heat. Therefore, the heat energy of the heater member 268 is conducted from the heater member to the continuous electrode 302 and the discrete electrodes 304. Then, the living tissue L_(T) receives the heat from the front surfaces of the continuous electrode 302 and the discrete electrodes 304, and is cauterized. Subsequently, when the impedance Z reaches the threshold value Z2, the supply of the high-frequency energy and heat energy is stopped. That is, when the pedal 216 a of the foot switch 216 is continuously pressed and the impedance Z reaches the threshold value Z2, the treatment automatically ends.

Here, there will be described a case where, for example, intestinal canals I_(C1), I_(C2) of a small intestine are anastomosed with each other by use of the treatment system 210 having such a function as shown in FIGS. 20A to 20C.

The holding faces 272 b, 276 b of the first and second holding members 262, 264 hold a pair of arranged intestinal canals I_(C1), I_(C2) between the wall surfaces of both the intestinal canals I_(C1), I_(C2). When the pedal 216 a of the foot switch 216 is pressed in this state, the energy is supplied to the first and second high-frequency electrodes 266, 270, respectively. Then, the intestinal canals I_(C1), I_(C2) held between the continuous electrode 302 of the first holding member 262 and the continuous electrode 306 of the second holding member 264 are heated and denatured. In consequence, the wall surfaces of the intestinal canals I_(C1), I_(C2) are continuously denatured.

Moreover, simultaneously with the denaturation of the living tissue by the continuous electrodes 302, 306, the intestinal canals I_(C1), I_(C2) between the discrete electrodes 304 of the first holding member 262 and the discrete electrodes 308 of the second holding member 264 are denatured. In consequence, the wall surfaces of the intestinal canals I_(C1), I_(C2) are discretely denatured.

Afterward, when the impedance Z reaches the threshold value Z1, the amount of the high-frequency energy to be supplied is reduced to switch to the monitor output, and the energy is supplied to the heater member 268 to generate the heat from the heater member 268. In consequence, the heat is conducted from the heater member 268 to the continuous electrode 302 and the discrete electrodes 304 owing to the heat energy generated from the heater member 268, and the heat is conducted to the intestinal canals I_(C1), I_(C2) to bond the wall surfaces to each other. Subsequently, when the impedance Z reaches the threshold value Z2, the supply of the energy automatically stops, thereby ending the treatment.

Thus, the living tissues of the intestinal canals I_(C1), I_(C2) are discretely denatured and bonded to each other.

Then, the supply of the energy to the first and second high-frequency electrodes 266, 270 and the heater member 268 is stopped. Afterward, while the intestinal canals I_(C1), I_(C2) are grasped, the cutter driving knob 234 shown in FIG. 9 is operated to move forwards the cutter 254 along the cutter guide grooves 262 a, 264 a from the state shown in FIGS. 10A and 10B. When the cutter 254 moves forwards, a portion denatured and bonded by the continuous electrodes 302, 306 is cut. Then, the cutter 254 cuts the inner portion of the substantially U-shaped denatured portion is cut to the vicinity of the distal end of the portion with the continuous electrodes 302, 306. Therefore, a portion between the substantially U-shaped sealed portions of the wall surfaces of the intestinal canals I_(C1), I_(C2) is cut to connect the wall surfaces of the intestinal canals I_(C1), I_(C2) to each other. That is, the wall surfaces of the intestinal canals I_(C1), I_(C2) are anastomosed with each other.

The holding section opening/closing knob 232 of the handle 222 is operated in this state to open the first and second holding members 262, 264. At this time, a first anastomosed portion A_(N1) on a mesenterium M side and a second anastomosed portion A_(N2) on a side opposite to a side provided with the mesenterium M are formed. As shown in, for example, FIG. 20B, the continuously bonded outer portion of the second anastomosed portion A_(N2) is discretely denatured.

Furthermore, in a state in which the first and second holding members 262, 264 are closed to hold the ends of the intestinal canals I_(C1), I_(C2), the pedal 16 a of the foot switch 16 is pressed to apply the high-frequency energy and the heat energy. In consequence, as shown in FIG. 20C, the ends of the intestinal canals I_(C1), I_(C2) are denatured and sealed by the high-frequency electrodes 266, 270 and the heater member 268. That is, the ends of the intestinal canals I_(C1), I_(C2) are provided with a seal portion Sp. At this time, the section cut along the 20A-20A line of FIG. 20C schematically has the state shown in FIG. 20A. In consequence, the intestinal canals I_(C1), I_(C2) having the ends thereof sealed with the seal portion S_(P) are anastomosed with each other.

It is to be noted that the extra portion of the seal portion S_(P) is cut with, for example, the cutter 254. At this time, the continuously bonded peripheral portion of the sealed end (the seal portion S_(P)) of the intestinal canals I_(C1), I_(C2) is discretely denatured in the same manner as in FIG. 20B. That is, the living tissue between the portions of the intestinal canals I_(C1), I_(C2) denatured and bonded by the discrete electrodes 304, 308 is not denatured. Therefore, the periphery (the vicinity) of the portion of the living tissue bonded by the discrete electrodes 304, 308 comes in contact with (comes in close contact with) the living tissue of the intestinal canals I_(C1), I_(C2) which are not denatured.

Therefore, at the first anastomosed portion A_(N1) on the mesenterium M side, a force is exerted in a direction in which the intestinal canals I_(C1), I_(C2) come in close contact with each other. Then, the portion where the living tissue has been denatured by the discrete electrodes 304, 308 exerts such a force that the living tissues more firmly come in close contact with each other. Furthermore, at the second anastomosed portion A_(N2) on the side opposite to the side provided with the mesenterium M, a force F₁ is exerted in a direction in which the intestinal canals I_(C1), I_(C2) open, but the portion in which the living tissue has been denatured by the discrete electrodes 304, 308 exerts such a force that the living tissues come in close contact with each other. Therefore, the mutual network of the living tissues of the intestinal canals I_(C1), I_(C2) which are not denatured is generated, and the tissue regenerative force of the living tissue is exerted, whereby the living tissues of the intestinal canals I_(C1), I_(C2) are regenerated earlier.

As described above, according to this modification, the following effect is obtained.

The continuous electrodes 302, 306 and the discrete electrodes 304, 308 are arranged on the holding faces 272 b, 276 b of the first and second holding members 262, 264, respectively. Then, the living tissue (e.g., the intestinal canals I_(C1), I_(C2)) between the continuous electrode 302 of the first holding member 262 and the continuous electrode 306 of the second holding member 264 can be heated, denatured and continuously bonded. Therefore, for example, tubular living tissues can be brought into close contact with each other or sealed. Furthermore, the living tissue (e.g., the intestinal canals I_(C1), I_(C2)) between the discrete electrodes 304 of the first holding member 262 and the discrete electrodes 308 of the second holding member 264 can be heated, denatured and continuously bonded to each other. That is, the living tissues can discretely be bonded to each other.

At this time, as shown in, for example, FIG. 20B, a portion in which the living tissues are continuously denatured and bonded to each other is positioned close to a portion in which the living tissues are discretely denatured and bonded to each other. Then, a portion between the living tissues around the portion in which the living tissues are discretely denatured and bonded to each other is not denatured. In consequence, it is possible to maintain a state where the living tissues which are not denatured around the discretely denatured and bonded portion are brought into (close) contact with each other. That is, the discrete electrodes 304, 308 perform a great role in maintaining the close contact state of the living tissues to which the force F₁ having, for example, such a direction that the tissues come away from each other is applied.

In a case where, for example, two intestinal canals I_(C1), I_(C2) are anastomosed with each other, the force F₁ acts in a direction in which the intestinal canals I_(C1), I_(C2) come away from each other on the side opposite to the side provided with the mesenterium M shown in FIGS. 20A and 20C. However, the intestinal canals I_(C1), I_(C2) are discretely bonded to each other by the discrete electrodes 304, so that the intestinal canals I_(C1), I_(C2) can discretely be bonded to each other. Therefore, the mutual close contact state of the intestinal canals I_(C1), I_(C2) can be maintained.

Therefore, the portion between the living tissues bonded to each other by the discrete electrodes 304, 308 performs a function of maintaining a state in which the living tissues are drawn to each other and brought into close contact with each other. That is, the portion between the living tissues bonded to each other by the discrete electrodes 304, 308 performs a function of maintaining the conglutination of the living tissues. Therefore, the mutual network of the living tissues brought into close contact (conglutinated) with each other is generated, and the tissue regenerative force of the living tissue is more easily exerted, whereby the living tissue can be regenerated earlier.

It is to be noted that in this modification, it has been described that the discrete electrodes 304 of the first holding member 262 are arranged at substantially equal intervals, and have a substantially equal area, but the space between the adjacent discrete electrodes 304 preferably varies, and the area of the discrete electrode 304 preferably varies. When the tissues are discretely treated by the discrete electrodes 304, the portions which come in contact with the discrete electrodes 304 are denatured. However, the discrete electrodes 304 may variously be modified as long as it is possible to maintain a state in which a part of the living tissue between the discrete electrodes 304 disposed adjacent to each other is not denatured and the living tissues are brought into contact with each other. Needless to say, this also applies to the discrete electrodes 308 of the second holding member 264. Moreover, the heater set temperature of the discrete electrode, the heater set temperature of the continuous electrode, output time and output timing may variously be combined so that a difference is given between them.

It is to be noted that in this modification, a case where the cutter 254 is provided has been described, but the cutter 254 does not have to be provided, depending on the treatment target. In a case where the cutter 254 is not provided, the above cutter guide grooves 262 a, 264 a can function as a fluid discharge groove (a channel) which guides a fluid such as vapor or a liquid generated from the living tissue to the handle 222 of the energy treatment instrument 212.

Next, the modification of the discrete electrodes 304 is shown in FIG. 19D. With regard to the discrete electrodes 304 of the first holding member 262 shown in FIG. 19A, an example has been described in which the discrete electrodes are arranged at equal intervals along the substantially U-shaped virtual track disposed outside the substantially U-shaped continuous electrode 302. In addition, as shown in FIG. 19D, the discrete electrodes 304 are preferably arranged in zigzag vertex positions. That is, the discrete electrodes 304 are preferably arranged in two rows. In this case, the arrangement of the discrete electrodes 304 and a distance between the electrodes are appropriately determined in accordance with the magnitude of the output of the continuous electrode 302, the area of the discrete electrode 304 itself with respect to the living tissue and the like.

It is to be noted that the discrete electrodes 304 may be arranged at random, and various other changes are allowed. Moreover, the shape of the discrete electrode 304 may variously be changed to a rectangular shape, an elliptic shape, a rhombic shape, a polygonal shape or the like.

As described above, according to this modification, the following effect is obtained.

The continuous electrodes 302, 306 and the discrete electrodes 304, 308 are arranged on the holding faces 272 b, 276 b of the first and second holding members 262, 264, respectively. Then, the living tissues (e.g., the intestinal canals I_(C1), I_(C2)) between the continuous electrode 302 of the first holding member 262 and the continuous electrode 302 of the second holding member 264 can be heated, denatured and continuously bonded. Therefore, for example, tubular living tissues can be brought into close contact with each other and sealed. Furthermore, the living tissues (e.g., the intestinal canals I_(C1), I_(C2)) between the discrete electrodes 304 of the first holding member 262 and the discrete electrodes 308 of the second holding member 264 can be heated and denatured to bond the living tissues to each other. That is, the living tissues can discretely be bonded to each other.

At this time, as shown in, for example, FIG. 20B, a portion in which the living tissues are continuously denatured and bonded to each other is positioned close to a portion in which the tissues are discretely denatured and bonded to each other. Then, a portion between the living tissues around the discretely denatured and bonded portion is not denatured. Therefore, the living tissues which are not denatured around the discretely denatured and bonded portion can be brought into (close) contact with each other. That is, the discrete electrodes 304, 308 perform a great role in maintaining, for example, a state where the living tissues to which the forces F₁ having a detaching direction are applied are brought into close contact with each other.

In a case where, for example, two intestinal canals I_(C1), I_(C2) are anastomosed with each other, the forces F₁ act in a direction in which the intestinal canals I_(C1), I_(C2) come away from each other on the side opposite to the side provided with the mesenterium M as shown in FIGS. 20A and 20C. However, the intestinal canals I_(C1), I_(C2) are discretely bonded to each other by the discrete electrodes 304, so that the intestinal canals I_(C1), I_(C2) can discretely be bonded to each other. Therefore, the intestinal canals I_(C1), I_(C2) can be maintained in a state in which the canals are brought into close contact with each other.

Therefore, the portion of the living tissues bonded to each other by the discrete electrodes 304, 308 performs a function of maintaining the state in which the living tissues are drawn to each other and brought into close contact with each other. That is, the portion of the living tissues bonded to each other by the discrete electrodes 304, 308 performs a function of maintaining the conglutination of the tissues. In consequence, the mutual network of the living tissues brought into contact (conglutinated) with each other is generated, the tissue regenerative force of the living tissue is more easily exerted, and the living tissue can be regenerated earlier.

It is to be noted that in this modification, it has been described that the discrete electrodes 304 of the first holding member 262 are arranged at substantially equal intervals, and have a substantially equal area, but it is preferable that the space between the adjacent discrete electrodes 304 or the area of the discrete electrode 304 varies. In a case where the tissues are discretely treated by the discrete electrodes 304, the portions which come in contact with the discrete electrodes 304 are denatured, but the discrete electrodes 304 may variously be modified as long as it is possible to maintain a state in which a part of the living tissue between the discrete electrodes 304 disposed adjacent to each other is not denatured and the living tissues are brought into contact with each other.

Fourth Modification of Second Embodiment

Next, a fourth modification will be described with reference to FIG. 21A. In this modification, the configuration of a first high-frequency electrode 266 provided on a main body 272 of a first holding member 262 will be described.

As shown in FIG. 21A, outside a substantially U-shaped continuous electrode 302, a plurality of branched electrodes (a maintaining member, a second bonding member) 312 branched from the continuous electrode 302 are integrally formed. These branched electrodes 312 extend in a direction crossing the axial direction of the continuous electrode 302 at right angles. That is, in this modification, the branched electrodes 312 are arranged instead of the discrete electrodes 304 described in the third modification.

The respective branched electrodes 312 are formed with a substantially equal length and a substantially equal width. That is, the respective branched electrodes 312 extend as much as a substantially equal area from the continuous electrode 302. A space between the branched electrodes 312 is a substantially equal space.

It is to be noted that the branched electrodes 312 denature a living tissue L_(T) which comes in contact with the branched electrodes 312, but the electrodes 312 emit output to such an extent that the denaturation of the living tissue L_(T) between the adjacent branched electrodes 312 is prevented. Such output depends on energy input from a high-frequency energy output circuit 292 or a heat generation element driving circuit 294 to the branched electrodes 312, additionally the space between the branched electrodes 312, the width of the branched electrode 312 itself and the like.

The function and effect of a treatment system 210 according to this modification are similar to those described in the second embodiment and the third modification of the second embodiment, and hence the description thereof is omitted.

It is to be noted that the length and width (thickness) of each branched electrode 312, further the space between the branched electrodes 312 and the number of the branched electrodes 312 are appropriately set. In FIG. 21A, it is depicted that the thickness of the continuous electrode 302 is larger than that of the branched electrode 312, but the thickness may be equal, and the thickness of the branched electrode 312 may be larger.

With regard to the branched electrodes 312, for example, modifications shown in FIGS. 21B and 21C are allowed. The modification of the branched electrodes 312 will be described with reference to FIG. 21B.

As shown in FIG. 21B, branched electrodes (a maintaining member, a second bonding member) 314 on the most distal end (a side away from a base portion 274) of a main body 272 of a first holding member 262 are deformed with respect to the branched electrodes 312 on the most distal end of the main body 272 of the first holding member 262 shown in FIG. 21A. That is, the branched electrodes 314 shown in FIG. 21B are formed to be long as compared with the branched electrodes 312 on the most distal end of the main body 272 of the first holding member 262 shown in FIG. 21A.

Moreover, the branched electrodes 312 on the most distal end shown in FIG. 21A extend only in one direction (straight). On the other hand, the extending angle of each of the branched electrodes 314 shown in FIG. 21B halfway changes (the electrode is halfway bent). This is because a bonding force to bond intestinal canals I_(C1), I_(C2) to each other is increased to prevent the release of the anastomosing of the canals, in a case where when the intestinal canals I_(C1), I_(C2) are anastomosed as shown in, for example, FIG. 20C, forces F₂ act so that the anastomosing of the intestinal canals I_(C1), I_(C2) is released from the distal end of a portion denatured by a continuous electrode 302, that is, a portion B_(i) where the intestinal canals I_(C1), I_(C2) are branched.

The respective branched electrodes 314 shown in FIG. 21B extend in at least two directions. Each of these branched electrodes 314 includes a first portion 314 a formed integrally with the continuous electrode 302 and extended in a direction crossing a substantially U-shaped virtual track of the continuous electrode 302 at right angles, and a second portion 314 b formed integrally with the first portion 314 a and extended further from the first portion 314 a. The second portion 314 b of these portions extend in parallel with the branched electrodes 312. Then, in such a constitution, the branched electrode 314 has the first portion 314 a and the second portion 314 b, whereby a bonding area corresponding to the forces F₂ generated in the branched portion B_(i) can be increased. That is, owing to the first portion 314 a and the second portion 314 b, the intestinal canals C_(C1), I_(C2) bonded to each other do not easily peel.

Therefore, a resistance to the forces F₂ applied to the intestinal canals I_(C1), I_(C2) can be increased, so that a state in which the anastomosing of the intestinal canals I_(C1), I_(C2) is not easily released can be obtained.

Next, a further modification of the branched electrodes 312 will be described with reference to FIG. 21C.

As shown in FIG. 21C, branched electrodes (a maintaining member, a second bonding member) 316 of a first holding member 262 are deformed with respect to the branched electrodes 312 of the first holding member 262 shown in FIG. 21A. The branched electrodes 316 are arranged in an oblique direction, instead of a direction crossing the axial direction of a continuous electrode 302 (a substantially U-shaped virtual track) of the continuous electrode 302. In this modification, the branched electrodes 316 extend toward, for example, a proximal end.

Therefore, as shown in FIG. 20D, in intestinal canals I_(C1), I_(C2), there are a portion bonded by the continuous electrode 302 and portions bonded by the branched electrodes 316 with an appropriate angle with respect to the longitudinal direction of the portion bonded by the continuous electrode 302. These branched electrodes 316 are formed to be long as compared with the branched electrodes 312 shown in FIG. 21A. Moreover, the portions bonded by the branched electrodes 316 are disposed obliquely with respect to the direction of forces F₁ applied to the intestinal canals I_(C1), I_(C2). Therefore, with regard to the branched electrodes 316, a bonding area corresponding to the forces F₁ having a direction to release anastomosing increases, so that a state in which the anastomosing of the intestinal canals I_(C1), I_(C2) is not easily released can be obtained. Therefore, the branched electrodes 316 having an appropriate angle with respect to the longitudinal direction of the portion connected to the continuous electrode 302 can have an increased bonding force to bond the intestinal canals I_(C1), I_(C2) to each other.

It is to be noted that as shown in FIG. 21C, branched electrodes (a maintaining member, a second bonding member) 318 on the most distal end of the first holding member 262 are deformed with respect to the branched electrodes 312, 314 on the most distal end of the first holding member 262 shown in FIGS. 21A and 21B. That is, these branched electrodes 318 of this modification are formed to be long as compared with the branched electrodes 312, 314 on the most distal end of the first holding member 262 shown in FIGS. 21A and 21B.

Furthermore, the branched electrodes 318 shown in FIG. 21C are circularly extended. Therefore, the branched electrodes 318 are extended in a direction different from that of the branched electrodes 316. In such branched electrodes 318 provided on the distal end of the first holding member 262, a resistance is increased against a time when forces F₂ are generated in a portion B_(i) as shown in FIG. 21C, in a case where the intestinal canals I_(C1), I_(C2) are anastomosed are anastomosed. In consequence, the intestinal canals I_(C1), I_(C2) do not easily peel from each other.

This is because the bonding force to bond the intestinal canals I_(C1), I_(C2) to each other is increased to prevent the release of the anastomosing, in a case where, for example, when the intestinal canals I_(C1), I_(C2) are anastomosed, the forces F₂ act so that the anastomosing of the intestinal canals I_(C1), I_(C2) with each other is released from the distal end of a portion denatured by the continuous electrode 302, that is, the portion B_(i) where the intestinal canals I_(C1), I_(C2) are branched from each other.

It is to be noted that in this modification, the branched electrodes 314 each having the first portion 314 a and the second portion 314 b and the branched electrodes 318 have been described as the branched electrodes disposed on the most distal end of the main body 272 of the first holding member 262 in a case where the area of the bonding portion corresponding to the forces F₂ is increased. However, the shapes of the branched electrodes disposed on the most distal end of the main body 272 of the first holding member 262 are not limited to these branched electrodes 314, 318, as long as the area of the bonding portion corresponding to the forces F₂ increases.

Fifth Modification of Second Embodiment

Next, a fifth modification will be described with reference to FIGS. 22A to 22C. In this modification, the configuration of a first high-frequency electrode 266 provided on a main body 272 of a first holding member 262 will be described.

As shown in FIG. 22A, the first high-frequency electrode 266 (a continuous electrode 302 and discrete electrodes 304) is arranged at substantially the same position as that in the third modification shown in FIG. 19A. Moreover, a heater member 268 is also arranged at substantially the same position as that in the third modification shown in FIG. 19A.

As shown in FIGS. 22A and 22B, the main body 272 is provided with a first fluid discharge groove (a fluid discharge groove for the continuous electrode) 332 as the channel of a fluid such as vapor or a high-temperature liquid outside the continuous electrode 302. The main body 272 is provided with second fluid discharge grooves (fluid discharge grooves for the discrete electrodes) 334 as the channels of a fluid such as the vapor or the high-temperature liquid in the outer peripheries of the discrete electrodes 304. These first and second fluid discharge grooves 332, 334 are connected to each other via communication paths 336. The communication paths 336 are formed as conduits. That is, the respective communication paths 336 are formed in the main body 272. Then, the respective communication paths 336 are connected to a cutter guide groove 262 a in a base portion 274. That is, the first and second fluid discharge grooves 332, 334 are connected to the cutter guide groove 262 a in the base portion 274.

In the main body 272 of the first holding member 262, a barrier portion (a dam) 342 for the continuous electrode 302 is formed outside the first fluid discharge groove 332 so that a fluid such as the vapor or the high-temperature liquid discharged owing to the function (including the function of the heater member 268) of the continuous electrode 302 flows into the first fluid discharge groove 332. In the main body 272, barrier portions 344 for the discrete electrodes 304 are formed in the outer peripheries of the second fluid discharge grooves 334 so that a fluid such as the vapor or the high-temperature liquid discharged owing to the function (including the function of the heater member 268) of the discrete electrodes 304 flows into the second fluid discharge grooves 334. As shown in FIG. 22B, these barrier portions 342, 344 are protruded from the plane a holding face 272 b of the main body.

It is to be noted that similarly in a second holding member 264, a fluid discharge groove (conveniently denoted with reference numeral 352) is formed outside a continuous electrode 306, and a barrier portion (conveniently denoted with reference numeral 362) is formed outside the fluid discharge groove 352. Moreover, fluid discharge grooves (conveniently denoted with reference numeral 354) are formed in the outer peripheries of discrete electrodes 308 of the second holding member 264, and barrier portions (conveniently denoted with reference numeral 364) are formed in the outer peripheries of the fluid discharge grooves 354. Then, the fluid discharge groove 352 outside the continuous electrode 306 is connected to the fluid discharge grooves 354 in the outer peripheries of the discrete electrodes 308 via a communication path (conveniently denoted with reference numeral 356).

Next, the function of a treatment system 210 according to this modification will be described.

As described in the second embodiment, a living tissue L_(T) as a treatment target is held between the first holding member 262 and the second holding member 264. At this time, the barrier portions 342, 344 of the main body 272 of the first holding member 262 and the barrier portions 362, 364 of a main body 276 of the second holding member 264 come in close contact with the living tissue L_(T), and the living tissue L_(T) comes in contact with the first high-frequency electrode 266 and a second high-frequency electrode 270.

In this state, a pedal 216 a of a foot switch 216 is operated. Energy is supplied from an energy source 214 to the first high-frequency electrode 266 and the second high-frequency electrode 270, respectively. Then, the living tissue L_(T) between the first high-frequency electrode 266 and the second high-frequency electrode 270 is heated by high-frequency energy and heat energy. At this time, a fluid such as vapor or a liquid is discharged from, for example, the heated portion of the living tissue L_(T).

Here, the first fluid discharge groove 332 of the main body 272 of the first holding member 262 is arranged outside the continuous electrode 302, and the second fluid discharge grooves 334 are arranged in the outer peripheries of the discrete electrodes 304.

In consequence, the fluid discharged owing to the function of the continuous electrode 302 flows into the cutter guide groove 262 a, and also flows into the first fluid discharge groove 332. Then, the fluid is prevented from being discharged from the grooves by the barrier portion 342. Therefore, the fluid discharged from the living tissue L_(T) is kept internally from the barrier portion 342, and is prevented from being released from the barrier portion. That is, the barrier portion 342 performs the function of a dam which prevents the fluid discharged from the living tissue L_(T) from leaking from the barrier portion 342.

The fluid discharged owing to the function of the discrete electrodes 304 flows into the second fluid discharge grooves 334. Then, the fluid is prevented from flowing outwards by the barrier portions 344. In consequence, the fluid discharged from the living tissue L_(T) is kept internally from the barrier portions 344, and is prevented from being released from the portions. That is, the barrier portions 344 perform the function of a dam which prevents the fluid discharged from the living tissue L_(T) from leaking from the barrier portions 344.

The fluid which has flowed into the second fluid discharge grooves 334 flows into the first fluid discharge groove 332 through the communication paths 336. Then, this fluid joins the fluid which has flowed into the first fluid discharge groove 332 to flow toward the base portion 274 of the first holding member 262. Then, the fluid flows into the cutter guide groove 262 a connected to the first fluid discharge groove 332 in, for example, the base portion 274. The first fluid discharge groove 332 communicates with the inside of a cylindrical member 242 of a shaft 224 (not shown).

Then, the fluid is discharged from a surgical treatment instrument 12 via a fluid discharge port 244 a of a sheath 244 through a fluid discharge port 242 a of the cylindrical member 242 of the shaft 224.

As described above, according to this modification, the following effect is obtained. The description of an effect similar to that described in the fourth modification of the second embodiment is omitted.

When a high-frequency current is applied to the living tissue L_(T) as the treatment target held by a holding section 226 of the surgical treatment instrument 212, the barrier portions 342, 344, 362 and 364 are brought into close contact with the living tissue. In consequence, even when the fluid discharged from the living tissue L_(T) as the treatment target flows toward the barrier portions 342, 344 of the first holding member 262, the fluid can be introduced into the first and second fluid discharge grooves 332, 334, 352 and 354 and the communication paths 336, 356 of the first and second high-frequency electrodes 266, 270.

In consequence, another peripheral tissue can be prevented from being influenced by the fluid discharged from the portions treated by the high-frequency energy and heat energy during the treatment of the living tissue L_(T). That is, a position to be influenced during the treatment of the living tissue L_(T) can be limited to the living tissue L_(T) in which the high-frequency current is supplied between the first high-frequency electrode 266 and the second high-frequency electrode 270.

Therefore, according to this modification, a fluid such as the vapor or liquid (a high-temperature body fluid) generated from the living tissue L_(T) is discharged from the surgical treatment instrument 212 on the side of, for example, the proximal end of the shaft 224 or a handle 222, whereby a living tissue around the living tissue L_(T) as the treatment target can be inhibited from being influenced by a fluid such as the vapor or liquid (the body fluid).

Thus, when the thermal influence on the living tissue L_(T) is suppressed, it is important to guide a fluid such as the vapor or liquid to a position which does not come in contact with the tissue. In a case where a tissue which is larger than the holding section 226 to such an extent that the periphery of the holding section 226 is covered is subjected to the treatment, it can be prevented that the outside of the holding section 226 is thermally influenced. In a case where even a small open portion (space) from which a fluid such as the vapor or liquid leaks is formed in the holding section 226, the fluid is discharged from the portion, and thermally influences the living tissue L_(T) around the holding section 226.

Moreover, even when the peripheries of the high-frequency electrodes (energy release portions) 266, 270 are covered with the barrier portions 342, 344, 362 and 364 to eliminate such an open portion, an open portion might be formed owing to a fluid pressure such as the vapor pressure generated from the living tissue L_(T), and the fluid might be discharged. Therefore, it is useful means to provide channels (the first and second fluid discharge grooves 332, 334, 352 and 354 and the communication paths 336, 356) which suppress the discharge of the unnecessary fluid due to the rise of the fluid pressure and which guide and discharge the fluid in a predetermined direction.

Next, a modification of the communication paths 336 shown in FIGS. 22A and 22B will be described with reference to FIG. 22C.

As shown in FIG. 22C, a communication path 336 (hereinafter referred to as a first communication path) is formed as a conduit in the same manner as in the fifth modification. The first communication path 336 is provided with a tubular second communication path 338 also connected to a cutter guide groove 262 a of a main body 272.

Thus, a fluid generated from a living tissue L_(T) is passed through the first and second tubular communication paths 336, 338, whereby, for example, a fluid which might have a high temperature can be prevented as much as possible from being brought into contact with the living tissue L_(T).

Third Embodiment

Next, a third embodiment will be described with reference to FIGS. 23 to 24C. This embodiment is a modification of the first and second embodiments including various modifications.

Here, as one example of an energy treatment instrument, a circular type bipolar energy treatment instrument (a treatment instrument) 412 for performing a treatment, for example, through or outside an abdominal wall will be described.

As shown in FIG. 23, a treatment system 410 includes the energy treatment instrument 412, an energy source 214 and a foot switch 216. The surgical treatment instrument 412 includes a handle 422, a shaft 424 and an openable/closable holding section 426. The handle 422 is connected to the energy source 214 via a cable 228.

The handle 422 is provided with a holding section opening/closing knob 432 and a cutter driving lever 434. The holding section opening/closing knob 432 is rotatable with respect to the handle 422. When the holding section opening/closing knob 432 is rotated, for example, clockwise with respect to the handle 422, a detachable side holding section (a detachable side grasping section) 444 of the holding section 426 described later comes away from a main body side holding section (a main body side grasping section) 442 (see FIG. 24A). When the knob 432 is rotated counterclockwise, the detachable side holding section 444 comes close to the main body side holding section 442 (see FIG. 24B).

The shaft 424 is formed into a cylindrical shape. The shaft 424 is appropriately curved in consideration of an insertion property into a living tissue L_(T). Needless to say, it is also preferable that the shaft 424 is formed to be straight.

The distal end of the shaft 424 is provided with the holding section 426. As shown in FIGS. 24A and 24B, the holding section 426 includes the main body side holding section (a first holding member, a first jaw) 442 formed on the distal end of the shaft 424, and the detachable side holding section (a second holding member, a second jaw) 444 detachably attached to the main body side holding section 442. In a state in which the detachable side holding section 444 closes with respect to the main body side holding section 442, holding faces 442 a, 444 a of the main body side holding section 442 and the detachable side holding section 444 come in contact with each other.

The main body side holding section 442 includes a cylindrical member 452, a frame 454 and a pipe 456 for energization. These cylindrical member 452 and frame 454 have an insulation property. The cylindrical member 452 is connected to the distal end of the shaft 424. The frame 454 is arranged so that the frame is fixed to the cylindrical member 452.

The central axis of the frame 454 is opened. This opened central axis of the frame 454 is provided with the pipe 456 for energization so that the pipe 456 is movable in a predetermined range along the central axis of the frame 454. When the holding section opening/closing knob 432 is rotated, this pipe 456 for energization is movable in the predetermined range owing to, for example, the function of a ball screw (not shown) as shown in FIGS. 24A and 24B. This pipe 456 for energization is provided with a protrusion 456 a protruding inwardly in a diametric direction so that the protrusion 456 a can disengageably be engaged with a connecting portion 482 a of an energization shaft 482 of the detachable side holding section 444 described later.

As shown in FIGS. 24A and 24B, a cutter guide groove (a space) 466 is formed between the cylindrical member 452 and the frame 454. A cylindrical cutter 462 is arranged in this cutter guide groove 466. The proximal end of the cutter 462 is connected to the distal end of a pusher 464 for the cutter 462 provided on the inner side of the shaft 424. The cutter 462 is fixed to the outer peripheral surface of the pusher 464 for the cutter 462. Although not shown, the proximal end of the pusher 464 for the cutter 462 is connected to the cutter driving lever 434 of the handle 422. Therefore, when the cutter driving lever 434 of the handle 422 is operated, the cutter 462 moves via the pusher 464 for the cutter 462.

A first fluid passage (a fluid passage) 468 a is formed between the pusher 464 for the cutter 462 and the frame 454. Then, the shaft 424 or the handle 422 is provided with a fluid discharge port (not shown) through which the fluid passed through the first fluid passage 468 a is discharged.

As shown in FIGS. 24A to 24C, the distal end of the cylindrical member 452 is provided with a first high-frequency electrode 472 and a heater member 474 as an output member and an energy release section.

The first high-frequency electrode 472 is arranged outside the cutter guide groove 466 in which the cutter 462 is arranged. The first high-frequency electrode 472 is formed into an annular shape in the same manner as in the cutter guide groove 466. The first high-frequency electrode 472 is fixed to the distal end of a first energization line 472 a. The first energization line 472 a is connected to the cable 228 via the main body side holding section 442, the shaft 424 and the handle 422.

As shown in FIGS. 24A to 24C, the heater members 474 are fixed to the back surface of the first high-frequency electrode 472 at appropriate intervals. The heater member 474 is fixed to the distal end of an energization line 474 a for the heater. The energization line 474 a for the heater is connected to the cable 228 via the main body side holding section 442, the shaft 424 and the handle 422.

An annular vapor discharge groove 476 is formed outside the first high-frequency electrode 472. The vapor discharge groove 476 is connected to the first fluid passage 468 a. Outside the vapor discharge groove 476, the holding face (a tissue contact face) 442 a is formed at a position higher than the front surface of the first high-frequency electrode 472. That is, the holding face 442 a of the main body side holding section 442 is disposed closer to a head section 484 of the detachable side holding section 444 described later than the front surface of the first high-frequency electrode 472 is. Therefore, the holding face 442 a performs the function of a barrier portion (a dam) which prevents a fluid such as vapor from being discharged from the vapor discharge groove 476.

On the other hand, the detachable side holding section 444 includes the shaft 482 for energization having the connecting portion 482 a and the head section 484. The shaft 482 for energization has a circular section, and has one end tapered and the other end fixed to the head section 484. The connecting portion 482 a is formed into a concave-groove-like shape which is engageable with the protrusion 456 a of the pipe 456 for energization. The outer surface of the energization shaft 482 other than the connecting portion 482 a is insulated by coating or the like.

The head section 484 is provided with a second high-frequency electrode 486 so that the electrode 486 faces the first high-frequency electrode 472 of the main body side holding section 442. The second high-frequency electrode 486 is fixed to one end of a second energization line 486 a. The other end of the second energization line 486 a is electrically connected to the shaft 482 for energization.

On the inner side of the second high-frequency electrode 486 provided on the head section 484, an annular cutter receiving portion 488 is formed to receive the blade of the cutter 462. On the other hand, an annular fluid discharge groove 490 is formed outside the second high-frequency electrode 486. Outside the fluid discharge groove 490, the holding face (a tissue contact face) 444 a is formed at a position higher than the front surface of the second high-frequency electrode 486. That is, the holding face 444 a of the detachable side holding section 444 is disposed closer to the main body side holding section 442 than the front surface of the second high-frequency electrode 486 is. Therefore, the holding face 444 a performs a barrier portion (a dam) which prevents a fluid such as the vapor from being discharged from the fluid discharge groove 490.

Furthermore, the fluid discharge groove 490 is connected to a fluid discharge path 490 a of the head section 484 and the shaft 482 for energization. The fluid discharge path 490 a communicates with a second fluid passage (a fluid passage) 468 b of the pipe 456 for energization. The shaft 204 or the handle 202 is provided with a fluid discharge port (not shown) from which the fluid passed through the second fluid passage 468 b is discharged.

It is to be noted that the pipe 456 for energization is connected to the cable 228 via the shaft 424 and the handle 422. In consequence, when the connecting portion 482 a of the energization shaft 482 of the detachable side holding section 444 is engaged with the protrusion 456 a of the pipe 456 for energization, the second high-frequency electrode 486 is electrically connected to the pipe 456 for energization.

Next, the function of the treatment system 410 according to this embodiment will be described.

An operator operates a display section 296 (see FIG. 13) of the energy source 214 in advance to set the output conditions of the treatment system 210. Specifically, a set power Pset [W] of high-frequency energy output, a set temperature Tset [° C.] of heat energy output, threshold values Z1, Z2 of an impedance Z of the living tissue L_(T) and the like are set.

As shown in FIG. 24B, the holding section 426 and the shaft 424 of the surgical treatment instrument 412 are inserted into an abdominal cavity through, for example, an abdominal wall in a state in which the main body side holding section 442 is closed with respect to the detachable side holding section 444. The main body side holding section 442 and the detachable side holding section 444 of the surgical treatment instrument 412 are opposed to the living tissue L_(T) to be treated.

To grasp the living tissue L_(T) to be treated between the main body side holding section 442 and the detachable side holding section 444, the holding section opening/closing knob 432 of the handle 422 is operated. At this time, the knob 432 is rotated, for example, clockwise with respect to the handle 422. Then, as shown in FIG. 24A, the pipe 456 for energization is moved to the distal end with respect to the frame 454 of the shaft 424. Therefore, the main body side holding section 442 and the detachable side holding section 444 open, whereby the detachable side holding section 444 can come away from the main body side holding section 442.

Then, the living tissue L_(T) to be treated is arranged between the first high-frequency electrode 472 of the main body side holding section 442 and the second high-frequency electrode 486 of the detachable side holding section 444. The energization shaft 482 of the detachable side holding section 444 is inserted into the energization pipe 456 of the main body side holding section 442. In this state, the grasping section opening/closing knob 432 of the handle 422 is rotated, for example, counterclockwise. In consequence, the detachable side holding section 444 closes with respect to the main body side holding section 442. Thus, the living tissue L_(T) as the treatment target is held between the main body side holding section 442 and the detachable side holding section 444.

In this state, the pedal 216 a of the foot switch 216 is operated, and the energy is supplied from the energy source 214 to the first high-frequency electrode 472 and the second high-frequency electrode 486 via the cable 228. Therefore, the living tissue L_(T) between the main body side holding section 442 and the detachable side holding section 444 is heated by Joule heat. At this time, the impedance Z of the grasped living tissue L_(T) is measured by a high-frequency energy output circuit 292. The impedance Z at the time of treatment start is, for example, about 60 [Ω] as shown in FIG. 15. Subsequently, when the high-frequency current flows through the living tissue L_(T) and the living tissue L_(T) is cauterized, the value of the impedance Z once lowers and then rises.

Thus, when the living tissue L_(T) is cauterized, the fluid (a liquid (blood) and/or a gas (water vapor)) is discharged from the living tissue L_(T). At this time, the fluid discharged from the living tissue L_(T) is allowed to flow into the cutter guide groove 466 and the vapor discharge groove 476 of the main body side holding section 442 and to flow into the fluid discharge groove 490 of the detachable side holding section 444. Then, the fluid which has flowed into the cutter guide groove 466 and the vapor discharge groove 476 of the main body side holding section 442 is, for example, sucked and discharged from the cutter guide groove 466 to the shaft 424 through the first fluid passage 468 a. The fluid allowed to flow into the fluid discharge groove 490 of the detachable side holding section 444 is, for example, sucked and discharged from the fluid discharge path 490 a of the head section 484 and energization shaft 482 to the shaft 424 through the second fluid passage 468 b of the energization pipe 456.

Then, while the fluid is discharged from the living tissue L_(T), the fluid continues to flow into the groove. Therefore, the occurrence of thermal spread is prevented by the fluid discharged at a raised temperature from the living tissue L_(T), and the influence on a portion which is not the treatment target can be prevented.

Subsequently, a control section 290 judges whether the impedance Z during the high-frequency energy output calculated based on a signal from the high-frequency energy output circuit 292 is the preset threshold value Z1 (here, about 1000 [Ω] as shown in FIG. 15) or more. The threshold value Z1 is disposed in a position where the rise ratio of the beforehand known value of the impedance Z lowers. Then, in a case where it is judged that the impedance Z is smaller than the threshold value Z1, the high-frequency energy for the treatment is continuously applied to the living tissue L_(T) grasped between the electrodes 472 and 486 of the main body side holding section 442 and the detachable side holding section 444.

In a case where it is judged that the impedance Z is larger than the threshold value Z1, the control section 290 transmits a signal to a heat generation element driving circuit 294. Then, the heat generation element driving circuit 294 supplies a power to the heater member 474 so that the temperature of the heater member 474 is a preset temperature Tset [° C.], for example, a temperature of 100[° C.] to 300[° C.]. In consequence, the living tissue L_(T) grasped between the electrodes 472 and 486 of the main body side holding section 442 and the detachable side holding section 444 conducts heat to the first high-frequency electrode 472 owing to heat conduction from the heater member 474, and the heat coagulates the living tissue L_(T) internally from the side of the front surface of the living tissue L_(T) which comes in close contact with the first high-frequency electrode 472.

Subsequently, the control section 290 judges whether the impedance Z of the living tissue L_(T) monitored by the high-frequency energy output circuit 292 is a preset threshold value Z2 or more. In a case where it is judged that the impedance Z is smaller than the threshold value Z2, the energy continues to be applied to the heater member 474. On the other hand, in a case where it is judged that the impedance Z is the threshold value Z2 or more, the control section 290 issues a buzzer sound from a speaker 298, and stops the output of high-frequency energy and heat energy. In consequence, the treatment of the living tissue L_(T) by use of the treatment system 410 is completed.

In this case, the living tissue L_(T) is continuously (in a substantially annular state) denatured by the first and second high-frequency electrodes 472, 486.

Subsequently, when the cutter driving lever 434 of the handle 422 is operated, the cutter 462 protrudes from the cutter guide groove 466 of the main body side holding section 442, and moves toward the cutter receiving portion 488 of the detachable side holding section 444. The distal end of the cutter 462 has a blade, so that the treated living tissue L_(T) is cut into a circular shape or the like.

As described above, according to this embodiment, the following effect is obtained.

The first high-frequency electrode 472 and the heater member 474 are arranged on the main body side holding section 442, and the second high-frequency electrode 486 is arranged on the detachable side holding section 444. In consequence, the living tissue L_(T) between the main body side holding section 442 and the detachable side holding section 444 can be heated, denatured and bonded by the high-frequency energy and the heat energy. Therefore, the living tissues L_(T) are sealed into a substantially annular shape.

Moreover, in this embodiment, the bipolar surgical treatment instrument 412 has been described, but it is also preferable to use a monopolar high-frequency treatment as described in the first embodiment with reference to FIG. 3B.

First Modification of Third Embodiment

Next, a first modification will be described with reference to FIG. 25.

On a main body side holding section 442 of a surgical treatment instrument 412 shown in FIG. 25, unlike the first high-frequency electrode 472 of the third embodiment, a plurality of discrete electrodes 472 a for outputting high-frequency energy are arranged. The discrete electrodes 472 a are arranged at predetermined intervals along a circumference. Although not shown, a heater member 474 is arranged on the back surfaces of the plurality of discrete electrodes 472 a.

In each discrete electrode 472 a, instead of a vapor discharge groove 476, a fluid discharge hole 476 a is formed in the center of the discrete electrode 472 a. Furthermore, barrier portions 442 b having the same plane as holding faces 442 a are arranged in the outer peripheries of the respective discrete electrodes 472 a.

Therefore, the fluid discharged from the living tissue L_(T) owing to the function (including the function of the heater member 474) of the respective discrete electrodes 472 a is prevented from being released outwards by the barrier portions 442 b. Then, the fluid discharged from the living tissue L_(T) flows into the fluid discharge holes 476 a disposed in the centers of the discrete electrodes 472 a. In this case, the fluid which has flowed into the fluid discharge holes 476 a is, for example, sucked and discharged from a cutter guide groove 466 to a shaft 424 through a first fluid passage 468 a.

On the other hand, a second high-frequency electrode of a detachable side holding section 444 is not shown, but as described in the third embodiment, a continuous electrode formed into an annular shape may be arranged, or the second high-frequency electrode may be arranged similarly to (symmetrically with respect to) the discrete electrodes 472 a of the main body side holding section 442 according to this modification.

It is to be noted that in the third embodiment including this modification, the use of the high-frequency electrodes 472, 472 a shown in FIGS. 24C and 25 has been described, but the shapes and arrangement of the electrodes can variously be modified as in, for example, the configuration described in the second embodiment including various modifications. In consequence, for example, it is also preferable to arrange discrete electrodes or branched electrodes outside the high-frequency electrode 472 shown in FIG. 24C.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. 

1. A treatment method for a living tissue using energy comprising: a first step of outputting energy to a grasped living tissue and raising a temperature of cells of the grasped living tissue; a second step of, after the first step, outputting high-frequency energy to the grasped living tissue and destroying cell membranes of the grasped living tissue to discharge proteins in the cells to the outside of the cells; and a third step of, after the second step, outputting heat energy to the grasped living tissue and welding the proteins to each other while dehydrating the grasped living tissue.
 2. The treatment method according to claim 1, wherein the first step uses, as a judgment reference, biological information which is obtained from the grasped living tissue and which changes as the temperature of the grasped living tissue rises, when the first step shifts to the second step.
 3. The treatment method according to claim 2, wherein as the change of the biological information, at least one of an impedance value and phase information between the grasped living tissues is used.
 4. The treatment method according to claim 1, wherein the first step sets the temperature of the cells of the grasped living tissue to 100° C. or lower.
 5. The treatment method according to claim 1, wherein the first step uses at least one of an electrode and a heat generation element when the temperature of the cells of the grasped living tissue is raised.
 6. The treatment method according to claim 1, wherein the first step intermittently applies electric energy to the cells of the grasped living tissue.
 7. The treatment method according to claim 1, wherein the second step intermittently applies the high-frequency energy to the cells of the grasped living tissue.
 8. The treatment method according to claim 1, wherein the first step raises the temperature of the cells and decreases the amount of water in the living tissue.
 9. The treatment method according to claim 1, wherein the first step raises the temperature of the cells to a temperature lower than a temperature at which the cell membranes are destroyed.
 10. A treatment method for a living tissue using energy comprising: a first step of intermittently outputting high-frequency energy to a grasped living tissue, destroying cell membranes of the grasped living tissue to discharge proteins in the cells to the outside of the cells and welding the proteins to each other; and a second step of, after the first step, outputting heat energy to the grasped living tissue and dehydrating the grasped living tissue. 